Bill Sanders is Professor at California State University Los Angeles, School of Criminal Justice and Criminalistics, Los Angeles, CA. He has published in areas such as substance use, violence, crime, and unsafe sexual behaviours among young offenders, gang members, injection drug users, and those who experience homelessness. Dr. Sanders has also published on drug selling, drugs and crime, club drug use, prescription drug misuse, gang intervention and diversion, qualitative research methods, and the intersections of criminal justice and public health. He is also the author of the OUP textbook Gangs: An Introduction