Liaison Officers Association Professional Development Day

A Member of the Liaison Officers Association (LOA) since 2013, John Warren has been Chair of LOA’s Board of Directors since September 2024.  During his seven years on the board, he also served as Vice Chair and headed the Events Committee.  John is a senior special agent with the Peace Corps Office of Inspector General (OIG).  During his 30-year career in federal law enforcement, he was the first Assistant Inspector General for Investigations (AIGI) at the US International Development Finance Corporation, the AIGI at Peace Corps, an assistant special agent in charge at the Department of Homeland Security, and has served as a special agent at the U.S. Customs and Border Protection Office of Internal Affairs, the Department of Justice OIG, and the former U.S. Immigration and Naturalization Service. John was also a Diplomatic Security special agent, posted as the regional security officer (RSO) at the U.S. Consulate-General in Ciudad Juarez and assistant RSO at the U.S. embassy in Santiago, Chile and U.S. Consulate-General in Karachi, Pakistan. John served with the U.S. Army in Saudi Arabia during Operation Desert Shield/Desert Storm and is a graduate of George Mason University, where he received a bachelor’s degree in international studies.

Marvin Haiman is an assistant professor and the executive director of public safety and justice at the University of Virginia. He is also a visiting fellow and research scholar with Rutgers University. Haiman served as the chief of staff for the Metropolitan Police Department of Washington, D.C., between 2021 and 2024. In this capacity, Haiman oversaw daily operations of the Executive Office of the Chief of Police and was responsible for broad agency management and implementing strategic agency objectives. 

Haiman was responsible for several organizational units, including the Office of Communications, Office of General Counsel, Office of Wellness and the Professional Development Bureau. He served as the executive director of the Professional Development Bureau between 2017 and 2021, leading the Recruiting Division, Metropolitan Police Academy Division, Human Resource Management Division, Disciplinary Review Division, Testing and Assessment Division, Equal Employment Opportunity Division, Office of Communications and the Strategic Engagement Office (Volunteer Services). 

Prior to being named executive director, Haiman served in a variety of capacities between 2015 and 2017, including developing the agency’s Office of Volunteer Coordination, serving as chief of staff for the Technical Services Division tasked with a broad range of IT operations, and chief of staff for the Strategic Services Bureau supporting and leading the administration of police recruitment, training, policy and volunteer service matters for the department. 

Prior to returning to the Metropolitan Police Department, Haiman served as director for the Homeland Security Advisory Council for the U.S. Department of Homeland Security, where he established several key task forces for the secretary (e.g., Foreign Fighters, Integrity and Use of Force). Prior to his federal service, Haiman led the Recruiting Division for the Metropolitan Police Department of Washington, D.C., among various other positions. Haiman was responsible for restructuring the sworn hiring process, decreasing the amount of time it took to process candidates while increasing the quality of those officers hired. 

Haiman graduated from Johns Hopkins University with a master’s degree in management through the Police Executive Leadership Program. He earned his undergraduate degree in mathematics from the University of Iowa and received designation as a Certified Public Management Program through George Washington University, as well as certification in Strategic Project Management. Haiman is also a graduate of the Naval Postgraduate School Center for Homeland Defense and Security’s Executive Leadership Program. He received recognition by the International Association of Chiefs of Police in 2020 as a 40 under 40 recipient and the prestigious Gary P. Hayes Award by the Police Executive Research Forum. Haiman graduated from the Metropolitan Police Academy and continues his police service as a reserve police officer with the Metropolitan Police Department. Haiman resides with his family in Washington, D.C.

Dr. Tracie L. Keesee is a retired 25-year veteran of the Denver Police Department and former Deputy Commissioner of the New York Police Department. Dr. Keesee works to improve equity within law enforcement agencies and the vulnerable communities they serve. To do this, she works closely with communities to ensure their voices are centered in the co-production and redesigning of public safety systems.  She also uses data-driven and evidence-based interventions to help law enforcement agencies receive the resources needed to create more equitable outcomes and reduce harm.

Dr. Keesee served as Project Director of the Department of Justice-funded National Initiative for Building Community Trust and Justice Initiative and is the Co-Founder of the Center for Policing Equity (CPE). This research center provides decision-makers with data, stories, and relationships to facilitate bold, innovative, and lasting change. Dr. Keesee took a sabbatical from CPE in 2016 to serve the New York Police Department in several roles; first, as the Deputy Commissioner of Training for Commissioner William J. Bratton, directing the implementation of transformative initiatives, including restructuring the recruitment curriculum.

Subsequently, she served as the first-ever Deputy Commissioner of Equity and Inclusion for Commissioner O'Neill, where she was responsible for the overall organizational development and implementation of NYPD's Equity and Inclusion strategic framework. During this time, she also advised the Police Commissioner on implementing accountability systems that monitor training, recruitment, employee opportunities, and complaints to help increase the organization's ability to attract and retain an inclusive and diverse workforce.  Dr. Keesee returned to CPE in 2018 as the president until accepting a full-time associate professor position with the University of Virginia School of Professional and Continuing Studies.

In 2021, Dr. Keesee was appointed by the U.N. Human Rights Council President to serve as a member of an expert mechanism tasked with advancing racial justice and equity for Africans and people of African descent in the context of law enforcement around the world.

She holds a Bachelor of Arts degree in Political Science from Metropolitan State College-Denver, academic certifications in Public Policy and Public Administration and a Master of Arts degree in Criminal Justice from the University of Colorado at Denver, a Ph.D. in Intercultural Communications from the University of Denver, and a Diversity and Inclusion Certification from Cornell University. Dr. Keesee is also a graduate of the 203rd Session of the FBI National Academy at Quantico, Virginia. She has published numerous articles across various collected anthologies and peer-reviewed scientific journals.

Col. Beata Trojanowska currently serves as a Polish Police Liaison Officer in Washington, D.C. She started her service in Polish National Police in 1998 in Czestochowa, Poland. In 2002, she graduated from the Police Academy in Szczytno, and received her firstofficer rank. In the following years,she served in executive positions in the criminal and investigation divisions of the Police units in Silesia. She participated twice in the United Nations Peacekeeping Mission in Kosovo (UNMIK). After she came back from the peacekeeping missions, her career primarily focused on coordinating and managing international training for the police officers at the Police Training Centre in Legionowo.

In 2007, Ms. Trojanowska was promoted as a Head of Voivodship Chief Commander’s Office in Kielce. She served there for two years and then she moved to Warsaw to work as an advisor in Criminal Department in Polish National Police Headquarters. In 2013, she joined the Fugitive Unit in the Police Central Bureau of Investigation (CBŚP), where she supervised international cooperation in criminal cases. As a Head of CBŚP Chief Commander’s Office she mainly supervised and exchanged criminal information with Europol and US Federal law enforcement agencies. She also closely cooperated with police liaison officers accredited in Poland.  

On September 15, 2021, she was appointed to open the first Polish Police Liaison Office in the US. The office is situated in the Embassy of the Republic of Poland. 

Beata Trojanowska graduated from the University of Silesia in Katowice with a master’s degree in law.  She is also a graduate of the Postgraduate Studies of the Warsaw School of Economics in the field of project management. 

She has many awards and honors for her achievements from the Polish government as well as the United Nations.

A Member of the Liaison Officers Association (LOA) since 2013, John Warren has been Chair of LOA’s Board of Directors since September 2024.  During his seven years on the board, he also served as Vice Chair and headed the Events Committee.  John is a senior special agent with the Peace Corps Office of Inspector General (OIG).  During his 30-year career in federal law enforcement, he was the first Assistant Inspector General for Investigations (AIGI) at the US International Development Finance Corporation, the AIGI at Peace Corps, an assistant special agent in charge at the Department of Homeland Security, and has served as a special agent at the U.S. Customs and Border Protection Office of Internal Affairs, the Department of Justice OIG, and the former U.S. Immigration and Naturalization Service. John was also a Diplomatic Security special agent, posted as the regional security officer (RSO) at the U.S. Consulate-General in Ciudad Juarez and assistant RSO at the U.S. embassy in Santiago, Chile and U.S. Consulate-General in Karachi, Pakistan. John served with the U.S. Army in Saudi Arabia during Operation Desert Shield/Desert Storm and is a graduate of George Mason University, where he received a bachelor’s degree in international studies.

Karoline Preisser was born in Salzburg and pursued legal studies at the University of Vienna, specializing in international law. During and after her studies, she acquired valuable international experience at the Austrian Federal Economic Chamber’s Foreign Trade Office in Mexico City, the Permanent Mission of Austria to the United Nations in New York, and the European Parliament in Brussels.

In November 2012, she joined the federal public service and began working in the migration sector within the Department of Basic Care and Federal Assistance. In June 2016, she was appointed Deputy Head of Department. In addition to chairing the Federal-State Coordination Council, her active involvement at the European level is notable, including her roles as National Contact Point (NCP) for the EASO Reception Network and EPRA, as well as her participation in negotiations within the Asylum Working Group.

From July 2018, she served as Attaché for the Federal Ministry of the Interior (BMI) at the Austrian Embassy in Rome. The focus of bilateral cooperation between the BMI and Italy was on organized crime, border and immigration police matters, and asylum.

Effective October 1, 2021, Karoline Preisser was appointed Deputy Director of the Federal Office for Immigration and Asylum. In this role, she was primarily responsible for immigration law within the agency and represented the office at European and international levels; among other duties, she was the Austrian member of the GDISC Steering Group (General Directors' Immigration Services Conference).

Since November 2024, Karoline Preisser has been serving as Home Affairs Attaché at the Austrian Embassy in Washington, D.C.

Acting Operations Chief- North America and Caribbean

International Operations

Homeland Security Investigations 

Kevin Polk currently serves as the Acting Operations Chief for the North American and Caribbean Section within the International Operations Division of Homeland Security Investigations (HSI). In this role, he oversees international law enforcement operations and collaborates with global partners to disrupt transnational criminal organizations and prevent terrorism. International Operations is the largest investigative arm of the Department of Homeland Security operating overseas.

Previously, Mr. Polk was the Operations Manager for HSI’s offices in Mexico, overseeing all administrative and technical functions across seven offices in the region.

With over three decades of law enforcement experience, Mr. Polk also spent 19 years as a Special Agent with HSI in Columbia, South Carolina, leading a wide range of investigations related to national security, drug and human trafficking, financial crimes, customs fraud, and intellectual property violations. His extensive task force experience includes assignments with the Joint Terrorism Task Force (JTTF), Counterintelligence Task Force (CITF), Organized Crime Drug Enforcement Task Force (OCDETF), and the Drug Enforcement Administration (DEA) Task Force.

Mr. Polk began his law enforcement career with the Mt. Pleasant Police Department in South Carolina, serving in the Uniform Patrol Division and later as a Narcotics Detective, where he was assigned to the DEA Task Force in Charleston as a federally deputized Task Force Officer.

He holds a Bachelor’s degree in Criminal Justice from the University of South Carolina.

Sven Radke is currently Acting Senior Liaison Officer of the German Criminal Police Office (BKA) in Washington DC, a post he already held from 2019 to 2023.

As Liaison Officer Mr. Radke oversees and coordinates investigations between the German Police and the US and Canadian Law Enforcement Agencies; in particular on a federal level. He also assists with fugitive cases and mutual-legal assistance; and analyses the development of criminal and other police related laws. 

Mr. Radke began his BKA career in 1992 as the Deputy Head of the Economy Crime-Analysis Unit assigned to the Wiesbaden office; where he was also part of a national work group on economic crimes. 

In 1996, Mr. Radke became the Deputy Head of the Counter Narcotics Cocaine Unit, coordinating the national and international cooperation in drug related investigations. 

Between 1998 and 1999 Mr. Radke was the Deputy Head of the Advisory Unit for Legal Issues of Practical Policing and Legal Policy, before he deployed to Italy in 2000, serving as Liaison Officer in Rom. Right after his time in Italy he was assigned as BKA Liaison Officer in Beijing for the People’s Republic China and Hong Kong SAR. During his time in China he was not only an honorary judge in the Red Cross International Humanitarian Moot Courts but also served as Chairman of the Foreign Law Enforcement Community China (FLECC). 

In 2010 Mr. Radke returned to the Wiesbaden field office as Deputy Head of the Joint Counter Terrorism Centre Unit; overseeing the national and international coordination and information exchange on Islamist terrorism issues. Later on, Mr. Radke transferred to the Berlin field office as Deputy Head of the International Law Enforcement Capacity Building Unit. 

Between 2012 and 2013, Mr. Radke served as BKA Liaison Officer at the Crisis Response Centre of the German Ministry of Foreign Affairs; coordinating international hostage cases involving German citizens; before returning to the International Police Training and Capacity Building as Head of Unit. 

Since 2015 he acted additionally as Permanent Deputy Head of the Training Center Subdivision being in charge of supervision, coordination and organization of national and international police training. During his career at the BKA, he was also the manager of training projects for police forces in the Balkan region (2010 – 2012), East Africa (2011-2016) and a joint German-Serbian project for the Serbian police (2016-2018). 

After his assignment in Washington, DC he has become head of a counter terrorism unit investigating serious Islamist terrorism threats and attacks and acting subdivision chief in the field of Islamist terrorism. Mr. Radke’s academic credentials include a law degree (First State Exam) from the University in Freiburg, being a graduate civil servant from the District Court of Freiburg (Second State Exam), as well as graduate from the Senior Leadership Qualification program at the German Police Academy as well as the FBI National Academy.

Mark Fredrick has served in both local and federal law enforcement for approximately 27 years. Mark Fredrick has served as a local law enforcement officer with the Los Angeles Police Department and as a Special Agent with DEA in Seattle and Spokane, Washington. Mark Fredrick also served with DEA in Afghanistan for two years as a special advisor and mentor for the Afghan Counter Narcotics Police Sensitive Investigations Unit.  Prior to his current assignment at DEA Headquarters, Mark Fredrick was the Regional Attache at the U.S. Embassy in New Delhi, India for over six years.  In this position, he provided counter narcotics expertise and advice for the countries of India, Bangladesh, Nepal, Bhutan, Sri Lanka and the Maldives.  In this role, he also worked closely with numerous foreign partners and assisted with narcotics investigations through multiple international regions.  

Mark Fredrick is a native of rural Nebraska and has a Bachelor’s degree in Chemistry from Nebraska Wesleyan University. CA Fredrick has also received advanced training as an Emergency Medical Technician (EMT) with an emphasis in emergency medical treatment in a tactical environment.

Eric Fox is currently the Chief of ATF’s International Affairs Division. He was one of the Assistant Special Agents in Charge (ASAC) of the Phoenix Field Division from November 2020 through October 2023. Chief Fox began his ATF career in 2004 as an agent in the Las Vegas, NV Field Office. In 2012, Fox lateraled to the Legislative Affairs Division, where he worked as a Congressional Fellow sponsored by Georgetown University on Capitol Hill. In 2014, Fox took a promotion to the Internal Affairs Division as a Program Manager. In late 2014, he was reassigned as the Resident Agent in Charge (RAC) of the Jacksonville, FL Field Office.

Throughout his career he led and supervised investigations dismantling violent gangs, international firearms trafficking organizations, and outrageous firearm offenders.

Chief Fox received a Bachelor’s Degree in Criminology in 2002 from the University of Florida. 

Chief Fox and his wife Andrea have 2 daughters: Natalie and Anabella.

Marvin Haiman is an assistant professor and the executive director of public safety and justice at the University of Virginia. He is also a visiting fellow and research scholar with Rutgers University. Haiman served as the chief of staff for the Metropolitan Police Department of Washington, D.C., between 2021 and 2024. In this capacity, Haiman oversaw daily operations of the Executive Office of the Chief of Police and was responsible for broad agency management and implementing strategic agency objectives. 

Haiman was responsible for several organizational units, including the Office of Communications, Office of General Counsel, Office of Wellness and the Professional Development Bureau. He served as the executive director of the Professional Development Bureau between 2017 and 2021, leading the Recruiting Division, Metropolitan Police Academy Division, Human Resource Management Division, Disciplinary Review Division, Testing and Assessment Division, Equal Employment Opportunity Division, Office of Communications and the Strategic Engagement Office (Volunteer Services). 

Prior to being named executive director, Haiman served in a variety of capacities between 2015 and 2017, including developing the agency’s Office of Volunteer Coordination, serving as chief of staff for the Technical Services Division tasked with a broad range of IT operations, and chief of staff for the Strategic Services Bureau supporting and leading the administration of police recruitment, training, policy and volunteer service matters for the department. 

Prior to returning to the Metropolitan Police Department, Haiman served as director for the Homeland Security Advisory Council for the U.S. Department of Homeland Security, where he established several key task forces for the secretary (e.g., Foreign Fighters, Integrity and Use of Force). Prior to his federal service, Haiman led the Recruiting Division for the Metropolitan Police Department of Washington, D.C., among various other positions. Haiman was responsible for restructuring the sworn hiring process, decreasing the amount of time it took to process candidates while increasing the quality of those officers hired. 

Haiman graduated from Johns Hopkins University with a master’s degree in management through the Police Executive Leadership Program. He earned his undergraduate degree in mathematics from the University of Iowa and received designation as a Certified Public Management Program through George Washington University, as well as certification in Strategic Project Management. Haiman is also a graduate of the Naval Postgraduate School Center for Homeland Defense and Security’s Executive Leadership Program. He received recognition by the International Association of Chiefs of Police in 2020 as a 40 under 40 recipient and the prestigious Gary P. Hayes Award by the Police Executive Research Forum. Haiman graduated from the Metropolitan Police Academy and continues his police service as a reserve police officer with the Metropolitan Police Department. Haiman resides with his family in Washington, D.C.

Daniel R. Vizzi was appointed by the U.S. Deputy Attorney General as the Acting Director of INTERPOL Washington, the United States National Central Bureau (USNCB). INTERPOL Washington serves as the official U.S. liaison to INTERPOL’s global network of 196 member countries. In this role, Mr. Vizzi oversees the agency’s global law enforcement coordination efforts, directing the operational and strategic use of INTERPOL tools and services.

Prior to his current role, Mr. Vizzi served as the USNCB’s Assistant Director for the Global Police Services Division, where he led the agency’s foreign fugitive and missing persons missions while overseeing the distribution of critical law enforcement information to both domestic and international partners.

A criminal investigator with the U.S. Marshals Service (USMS) with two decades of distinguished federal law enforcement service, Mr. Vizzi has held progressive leadership roles at the USMS, including Senior Inspector, Assistant Chief Inspector, Chief Inspector, and Acting Deputy Assistant Director. He has led countless domestic and international operations and served in key positions in the District of New Jersey, the Central District of California, the District Court for the District of Columbia, and USMS Headquarters. In each of these roles, he has managed high-profile operations, driven policy innovation, and led teams in achieving global mission-critical goals.

As Assistant Chief Inspector, he led the U.S. Cabinet protective detail for the Secretary of Education, coordinating more than 400 domestic and international official visits, managing a $25 million budget, and developing global operational policies. As Chief Inspector of the Office of Protective Operations, he oversaw a $45 million annual budget and directed the protection of 2,500 federal judges, 30,300 court officials and 800 USMS-protected facilities. Notably, he commanded the Supreme Court of the U.S. Protective Response, the largest protective response mission in USMS history, mobilizing nearly 1,000 USMS personnel across hundreds of sites.

Mr. Vizzi holds a Bachelor of Science degree from John Jay College of Criminal Justice. He is the recipient of numerous performance awards and commendations recognizing his leadership and impact in federal law enforcement, including a USMS Director’s Award and the Homeland Security Today Trailblazer Award.

Gill Beswick has extensive Law Enforcement experience, having worked as an Investigator for British Customs for over 25 years prior to joining the National Crime Agency in 2021. Gill has worked overseas as a Liaison Officer for 14+ years, serving in Spain, Italy, China and the USA.

Gill was appointed Head of the North America team, National Crime Agency (NCA) in Washington DC in July 2023, leading a team of International Liaison Officers protecting the UK by delivering significant outcomes against a wide range of transnational organised crime threats: drugs and firearms trafficking, financial crime, Cyber and e-enabled crime, organised immigration crime, intelligence collection including all source analysis, child sexual exploitation and modern slavery. 

Robert is a UK National Crime Agency International Liaison Officer based at the British Embassy in Washington DC, covering the NCA’s Illicit Finance portfolio.

Robert joined the UK’s National Criminal Intelligence Service (NCIS) in 2003, and has held roles with Interpol, Europol and supporting the UK efforts to combat drugs trafficking from South America and the Caribbean

Robert has extensive experience in various Investigation and Intelligence roles in UK law enforcement on combatting serious organised crime across a range of threat areas such as drugs, firearms trafficking, money laundering, fraud and organised immigration crime.

He has led teams of Investigators and Intelligence officers investigating high priority NCA Operations into serious organised crime.

Gordon Graham, MA

Gordon Graham is a retired 33-year veteran of California Law Enforcement. During his tenure as a police professional, he was awarded his Teaching Credential from California State University, Long Beach. He was later graduated from University of Southern California with a Master's Degree in Safety and Systems Management.

Subsequent to this he was graduated from Western State University with a Juris Doctorate. He has taken this background as a street cop, supervisor and manager and coupled it with his formal education as a risk manager and his education and experiences as an attorney and is the Co-Founder of Lexipol – a company designed to standardize policies, procedures and training within law enforcement agencies around America.

In 1995, Mr. Graham received the Governor’s Award for Excellence in Law Enforcement Training, the highest tribute available in the critical mission of training police professionals. In 2005 he received the Presidential Award for Excellence from the IAFC for his lifelong work in improving firefighter safety and performance. In 2008 he received the lifetime achievement award from California POST. In 2015, Mr. Graham received the lifetime dedication award from the International Public Safety Leadership and Ethics Institute. In 2018 he received the James Oberstar Sentinel for Safety Award for his lifetime work in improving aviation safety internationally. In 2019 he received the Howard W. Rayon Distinguished Service Award.

He and “Mrs. G” are the proud parents of two adult children. A resident of Southern California, he enjoys spending every possible moment with Mrs. G “cruising the coast” either in their vintage wooden boat or their wooden car and finding new adventures and new places to enjoy a great meal.

Dr. Tracie L. Keesee is a retired 25-year veteran of the Denver Police Department and former Deputy Commissioner of the New York Police Department. Dr. Keesee works to improve equity within law enforcement agencies and the vulnerable communities they serve. To do this, she works closely with communities to ensure their voices are centered in the co-production and redesigning of public safety systems.  She also uses data-driven and evidence-based interventions to help law enforcement agencies receive the resources needed to create more equitable outcomes and reduce harm.

Dr. Keesee served as Project Director of the Department of Justice-funded National Initiative for Building Community Trust and Justice Initiative and is the Co-Founder of the Center for Policing Equity (CPE). This research center provides decision-makers with data, stories, and relationships to facilitate bold, innovative, and lasting change. Dr. Keesee took a sabbatical from CPE in 2016 to serve the New York Police Department in several roles; first, as the Deputy Commissioner of Training for Commissioner William J. Bratton, directing the implementation of transformative initiatives, including restructuring the recruitment curriculum.

Subsequently, she served as the first-ever Deputy Commissioner of Equity and Inclusion for Commissioner O'Neill, where she was responsible for the overall organizational development and implementation of NYPD's Equity and Inclusion strategic framework. During this time, she also advised the Police Commissioner on implementing accountability systems that monitor training, recruitment, employee opportunities, and complaints to help increase the organization's ability to attract and retain an inclusive and diverse workforce.  Dr. Keesee returned to CPE in 2018 as the president until accepting a full-time associate professor position with the University of Virginia School of Professional and Continuing Studies.

In 2021, Dr. Keesee was appointed by the U.N. Human Rights Council President to serve as a member of an expert mechanism tasked with advancing racial justice and equity for Africans and people of African descent in the context of law enforcement around the world.

She holds a Bachelor of Arts degree in Political Science from Metropolitan State College-Denver, academic certifications in Public Policy and Public Administration and a Master of Arts degree in Criminal Justice from the University of Colorado at Denver, a Ph.D. in Intercultural Communications from the University of Denver, and a Diversity and Inclusion Certification from Cornell University. Dr. Keesee is also a graduate of the 203rd Session of the FBI National Academy at Quantico, Virginia. She has published numerous articles across various collected anthologies and peer-reviewed scientific journals.

A Member of the Liaison Officers Association (LOA) since 2013, John Warren has been Chair of LOA’s Board of Directors since September 2024.  During his seven years on the board, he also served as Vice Chair and headed the Events Committee.  John is a senior special agent with the Peace Corps Office of Inspector General (OIG).  During his 30-year career in federal law enforcement, he was the first Assistant Inspector General for Investigations (AIGI) at the US International Development Finance Corporation, the AIGI at Peace Corps, an assistant special agent in charge at the Department of Homeland Security, and has served as a special agent at the U.S. Customs and Border Protection Office of Internal Affairs, the Department of Justice OIG, and the former U.S. Immigration and Naturalization Service. John was also a Diplomatic Security special agent, posted as the regional security officer (RSO) at the U.S. Consulate-General in Ciudad Juarez and assistant RSO at the U.S. embassy in Santiago, Chile and U.S. Consulate-General in Karachi, Pakistan. John served with the U.S. Army in Saudi Arabia during Operation Desert Shield/Desert Storm and is a graduate of George Mason University, where he received a bachelor’s degree in international studies.

Marvin Haiman is an assistant professor and the executive director of public safety and justice at the University of Virginia. He is also a visiting fellow and research scholar with Rutgers University. Haiman served as the chief of staff for the Metropolitan Police Department of Washington, D.C., between 2021 and 2024. In this capacity, Haiman oversaw daily operations of the Executive Office of the Chief of Police and was responsible for broad agency management and implementing strategic agency objectives. 

Haiman was responsible for several organizational units, including the Office of Communications, Office of General Counsel, Office of Wellness and the Professional Development Bureau. He served as the executive director of the Professional Development Bureau between 2017 and 2021, leading the Recruiting Division, Metropolitan Police Academy Division, Human Resource Management Division, Disciplinary Review Division, Testing and Assessment Division, Equal Employment Opportunity Division, Office of Communications and the Strategic Engagement Office (Volunteer Services). 

Prior to being named executive director, Haiman served in a variety of capacities between 2015 and 2017, including developing the agency’s Office of Volunteer Coordination, serving as chief of staff for the Technical Services Division tasked with a broad range of IT operations, and chief of staff for the Strategic Services Bureau supporting and leading the administration of police recruitment, training, policy and volunteer service matters for the department. 

Prior to returning to the Metropolitan Police Department, Haiman served as director for the Homeland Security Advisory Council for the U.S. Department of Homeland Security, where he established several key task forces for the secretary (e.g., Foreign Fighters, Integrity and Use of Force). Prior to his federal service, Haiman led the Recruiting Division for the Metropolitan Police Department of Washington, D.C., among various other positions. Haiman was responsible for restructuring the sworn hiring process, decreasing the amount of time it took to process candidates while increasing the quality of those officers hired. 

Haiman graduated from Johns Hopkins University with a master’s degree in management through the Police Executive Leadership Program. He earned his undergraduate degree in mathematics from the University of Iowa and received designation as a Certified Public Management Program through George Washington University, as well as certification in Strategic Project Management. Haiman is also a graduate of the Naval Postgraduate School Center for Homeland Defense and Security’s Executive Leadership Program. He received recognition by the International Association of Chiefs of Police in 2020 as a 40 under 40 recipient and the prestigious Gary P. Hayes Award by the Police Executive Research Forum. Haiman graduated from the Metropolitan Police Academy and continues his police service as a reserve police officer with the Metropolitan Police Department. Haiman resides with his family in Washington, D.C.