Clark is currently the dean’s executive professor of public health at Santa Clara University in Santa Clara, California. He is formerly the director of the Center for Substance Abuse Treatment Substance Abuse and Mental Health Services (SAMHSA), U.S. Department of Health and Human Services. He contributed to the U.S. Surgeon General’s Report on Alcohol, Drug Abuse, and Health as a section editor for Treatment. He is a member of the board of directors of the nonprofit Felton Institute. He is on the board of directors of Faces and Voices of Recovery. He is also on the board of directors of the Pacific Institute for Research and Evaluation and is a member of the board of directors of the Foundation for Opioid Research Efforts.
He has received numerous awards for his contributions to the field of substance abuse treatment, including the 2015 Lisa Mojer-Torres Award from Faces and Voices of Recovery, the 2015 James Ralph Memorial Award for Outstanding Public Service from the Black Psychiatrist of America, a 2015 Annual Award, American Society of Addiction Medicine. He was awarded the 2008 John P. McGovern Award from the American Society of Addiction Medicine.
Clark received a BA in chemistry from Wayne State University; he holds an MD and an MPH from the University of Michigan, where he completed a psychiatric residency at University Hospital, Neuropsychiatric Institute. He obtained his JD from Harvard University Law School and completed a 2-year Substance Abuse Fellowship at the DVAMC-SF. Clark received his board certification from the American Board of Psychiatry and Neurology in Psychiatry. He is a distinguished fellow of the American Society of Addiction Medicine. He is ABAM certified in addiction medicine. Clark is licensed to practice medicine in California, Maryland, Massachusetts, and Michigan. He is also a member of the Washington, DC, Bar.