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Addiction Faculty and Staff

​Carla Marienfeld, MD


Carla Marienfeld, MD, is a board-certified addiction psychiatrist who specializes in treating individuals with substance use disorders and co-occurring mental health conditions, such as anxiety and depression. She supports recovery in a harm-reduction approach that uses therapy, motivational interviewing, and medication-assisted treatment. 

An associate professor in the Department of Psychiatry, her research looks at health outcomes for individuals with substance use disorders and involves monitoring implementation of evidence based practices in treatment of substance use disorders. She has been highly involved in educating colleagues and trainees about addiction psychiatry and effective interventions, including buprenorphine treatment and motivational interviewing.

She is a member of many professional organizations, including the American Society of Addiction Medicine, the American Association of Addiction Psychiatry, and the American Psychiatric Association.

Scott Matthews, MD

Clinical Professor of Psychiatry
​​Co-Director of the Interprofessional Advanced Fellowship in Addiction Treatment. Dr. Matthews is also a Staff Psychiatrist at VA San Diego Healthcare System where he is Chief of the Consultation Liaison Division of the VA Psychiatry Service. He also provides care for veterans in one of the VA’s outpatient mood clinics. Dr. Matthews is actively involved in teaching residents and medical students.

Nick Mellos, MD

VA Site Training Director
​Dr. Mellos is the Acting Chief of Psychiatry at the VA and the VA Site Training Director. He completed his Addiction Psychiatry Fellowship at Yale University and is double Board Certified in General Psychiatry and Addiction Psychiatry.

Alicia Minns, MD

Associate Clinical Professor

​Dr. Alicia Minns grew up outside of Detroit, MI. She attended college at the University of Michigan and completed medical school at Tufts University in Boston. She then came to UCSD where she did her Emergency Medicine residency followed by a two-year fellowship in Medical Toxicology. Alicia is currently an Assistant Professor and serves as faculty in both Emergency Medicine and Medical Toxicology. She participates in research in both areas, and is the fellowship director for Medical Toxicology.