Dagmar Hedrich is a leading researcher of the European Monitoring Centre on Drugs and Drug Addiction (EMCDDA), a Lisbon based, de-centralized agency of the European Union responsible for data collection and analysis on drug use and drug policies. She was the head of a team conducting a study on the effectiveness of consumption rooms, available here.
Mike Trace is currently the Co-Director of the Beckley Foundation Drug Policy Programme and Chief Executive at RAPT (Rehabilitation of Addicted Prisoners Trust), one of the UK's foremost providers of drug addiction treatment.
Danny Kushlick is director of Transform Drug Policy Foundation. A former drug counsellor in the criminal justice system, he founded Transform in 1996 after recognising that prohibition caused his clients more problems than their drug use.
Ethan Nadelmann is the executive director of the largest drug policy reform organization in the U.S., the Drug Policy Alliance (www.drugpolicy.org ). Earlier he was a professor at the Princeton University. We interviewed him at the International Harm Reduction Conference, Warsaw, 2007.