ROBERT HOLMAN COOMBS, PhD, is Professor of Biobehavioral Sciences at UCLA School of Medicine, a Certified Addiction Specialist (CAS), and a Fellow of the American Association for the Advancement of Science. He serves on the International Advisory Committee of the American Academy of Healthcare Providers in the Addictive Disorders and is author or editor of more than 200 publications, including eighteen books.

WILLIAM A. HOWATT, PhD, EdD, is a faculty member of the Nova Scotia Community College School of Human Services. An Internationally Certified Addiction Specialist (ICAS), he recently completed a postdoctoral fellowship at the UCLA School of Medicine. Author of numerous publications, he is currently coediting (with Robert Holman Coombs) the Wiley Series on Treating Addictions.