At the time of this interview, Peter F. Zaizay was Liberia's deputy minister for administration and the acting minister for national security. He began his career in private security in 1986. He worked with the Jascere Security Services. In 1992, Zaizay joined the Liberian National Police, and he worked in the Patrol Division, the Criminal Investigation Division and the Criminal Intelligence Unit. He also served as an assistant director of police for press and public affairs from 2004 to 2006. Later, he became the deputy director of police for training and then the commandant of the National Police Training Academy, a position he held from 2006 to 2007.

At the time of the interview, General Behar Selimi was the Assistant Commissioner for Border Police of the Kosovo Police Service (KPS) and Acting Deputy Commissioner. He began his career in law enforcement in 1984 as a police academy cadet in the Yugoslavian system. He later organized a union of Kosovan ex-police officers who had been terminated during the political unrest of the 1990s. General Selimi became an officer in the Kosovan Police Service in 2000, serving as a traffic officer, public relations officer, and police service’s first spokesperson. In 2003, he became a Lieutenant Colonel in charge of VIP and vital facility protection. By 2004, he was the Deputy Commissioner of Administration, overseeing internal affairs, recruitment, budget issues, audit and control, departmental logistics, and more. He was appointed Assistant Police Commissioner for Border Police in 2007. General Selimi has also trained in Germany and the U.S.

At the time of this interview, Robin Campbell was a consultant for both public and private-sector organizations undergoing structural change, with a particular emphasis on police services in developing countries. He previously was the deputy change manager and director of corporate development responsible for the implementation of the Patten Commission recommendations for the police in Northern Ireland.  The Patten recommendations guided the 10-year process of police reform that saw the Royal Ulster Constabulary transformed into the Police Service of Northern Ireland.  Campbell served as the chief superintendent of the police service before launching his own consultancy.  He worked in many countries in the developing world.

Mark Kroeker served as the civilian police adviser in the United Nations' Department of Peacekeeping Operations, the top policing post in the U.N.  His other U.N. posts included that of police commissioner for the U.N.'s mission in Liberia and deputy commissioner of operations for the U.N. International Police Task Force in Bosnia and Herzegovina.  He was also chief of police in Portland, Oregon, and consulted for the U.S. Department of Justice in Haiti.  He was also a member of U.S. police development projects in Rwanda and Burundi.  He came to international policing after a 32-year career with the police department of Los Angeles, California.
 

At the time of this interview, Carlos Humberto Vargas García was the chief of studies at the National Academy of Public Security in El Salvador, an institution separate from the national police. From 1992 to 1995, he was the first sub-director of the academy, and he trained in the U.S. and Central America with ICITAP, the International Criminal Investigative Training Assistance Program. He also worked in the private sector, in other universities in El Salvador as a professor of engineering, and for the Instituto Salvadoreño de Formación Profesional, which is in charge of non-formal education.

At the time of this interview, Adrian Horn had a long career in the U.K. police, rising to the position of assistant chief constable. He left the police in 1994 to set up a policing consultancy. He has worked in a number of developing and post-conflict countries, and spent five years as the manager of the Department for International Development's Community Safety and Security Project in Sierra Leone. He worked closely with the Sierra Leonean police and Inspector General Keith Biddle during a challenging and transformational time for Sierra Leone.

At the time of this interview, José Hugo Granadino Mejía was chief of the professional training unit of the National Police of El Salvador. A lawyer and notary, he in 1993 became one of the first professors at the National Academy of Public Security (Academia Nacional de Seguridad Pública), an institution separate from the National Police. He also served as director of study and later as director general of the academy, and he worked as a professor of law at the Universidad de El Salvador for 25 years and at the Universidad Tecnológica de El Salvador.