William Cloud is Associate Professor at the Graduate School of Social Work at the University of Denver, where he developed and has been chair of the Drug Dependency Concentration in the M.S.W. program.
Robert Granfield is Associate Professor of Sociology at the University of Denver. They are the co-authors of Coming Clean: Overcoming Addiction without Treatment (also available from NYU Press) and have each taught, conducted research, and worked in the field of addiction for over twenty-five years.