Margaret L. Dowell is an adjunct professor of education and art at Mount Saint Mary's University and at Carroll Community College. Jack E. Henningfield is the vice president for research and health policy at Pinney Associates and an adjunct professor in the Department of Psychiatry and Behavioral Sciences at the Johns Hopkins University School of Medicine. He is a coeditor, along with Santora and Warren K. Bickel, of Addiction Treatment: Science and Policy for the Twenty-first Century, also published by Johns Hopkins.