Beatriz Caiuby Labate is Member of Research Staff at the Institute of Medical Psychology, Heidelberg University and a Member of the Collaborative Research Center Ritual Dynamics - Socio-Cultural Processes from a Historical and Culturally Comparative Perspective. She is author of the book A reinvencao do uso da ayahuasca nos centros urbanos (Mercado de Letras, 2004), and co-author of the books Religioes ayahuasqueiras: um balanco bibliografico (Mercado de Letras, 2008) translated into English as Ayahuasca religions: A comprehensive bibliography and critical essays (MAPS, 2009) and Musica Brasileira de Ayahuasca (Mercado de Letras, 2009). Edward MacRae lectures in anthropology at the Federal University of Bahia. He is also an associate researcher at the Center for Drug Abuse Studies and Therapy (CETAD) and leader of the Group for the Study of Psychoactive Substances (GIESP). He has written books written books about sexuality, social movements, the ritual use of ayahuasca in the Santo Daime religion, socially integrated use of psychoactive substances, and the reduction of harm associated with drug use.