 Haugen developed the investigative strategy, protocols and field methodology for gathering eye-witness testimony and physical evidence from nearly 100 mass grave and massacre sites across Rwanda.Haugen personally conducted and directed field investigations at various sites.Until April 1997, when he left the Department of Justice to found International Justice Mission, Haugen worked as a senior trial attorney with the Police Misconduct Task Force of the Civil Rights Division of the U.S. Department of Justice, where he worked on police misconduct cases, and on cases involving various forms of human rights abuses.