Dr. Vincent Cheng received his PhD in Sociology and Criminology from the University of Hong Kong. He has taught in a number of universities in Hong Kong including the University of Hong Kong and the Hong Kong Community College of the Hong Kong Polytechnic University before working in the School of Arts and Social Sciences in the Open University of Hong Kong as an assistant professor. He is interested in crime and punishment in general and his current research is about the experience of people who use drug in Hong Kong and Mainland China.