Roles in the care of patients with substance use and addictive disorders have included: Director of the Addiction Medicine Consultation and Treatment Service (AMCATS) at San Francisco General Hospital; Director of San Francisco’s Office-based Buprenorphine Induction Clinic (OBIC); and he is currently working in the Addiction Research and Treatment Services (ARTS) programs at the San Francisco VA. He is co-chair of the Addictions Council for the American Psychiatric Nurses Association (APNA), and is a member of the Association of Medical Educators and Researchers in Substance Abuse (AMERSA), the Motivational Interviewing Network of Trainers (MINT), and the International Nurses Society on Addictions (IntNSA). His recent publications have focused on stigma and access to care for people with opioid use disorder.