Dr. Roth is a Co-Investigator of the Engage Study in Vancouver, and has provided his expertise and advise on the selection of standardized and validated instruments for measuring social and behavioural constructs. Dr. Roth is also a Professor of Anthropology at the University of Victoria, where he is also a Scientist with the Center for Addictions Research of British Columbia. He has conducted field-based research in northern Kenya for over twenty years, focusing on HIV/AIDS risk perception and sexual risk behavior.