Mr. Ennis began his career during his senior year at the University of Vermont, working as a "University Year for Action" intern at a community mental health center providing both alcohol detox and mental health crisis services. Mr. Ennis obtained his Baccalaureate in Psychology (1979) from UVM, and his Masters in Social Work (1983) from the University of Connecticut. Mr. Ennis began his post-graduate career working in the mental health field.

Since 1985, he has worked for the Addiction Research and Treatment Services (ARTS), first as a substance abuse counselor, then as Clinic Supervisor, and finally as Director of six Denver area outpatient clinics for ARTS, including two opioid treatment programs. In addition, he is an instructor of psychiatry at the University of Colorado School of Medicine.

Mr. Ennis is the Chairperson of the Colorado Organization for the Treatment of Opioid Dependence and the Colorado delegate to the American Association for the Treatment of Opioid Dependence Board of Directors.

Mr. Ennis is married, the father of two great kids, and lives with his family in Denver.