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Division of Alcohol and Drug Abuse

Alcohol and Drug Abuse Inpatient Program

Program Leadership

Nancy Merill PMHCNS, BCNancy Merrill, PMHCNS, BC, Program Director

A board certified advanced practice psychiatric nurse for more than 30 years, Ms. Merrill has been working in McLean’s Division of Alcohol and Drug Abuse for the past 20 years. During her time at McLean she has been involved in several national research projects including the COMBINE study, the Topamax medication study and the integrated group therapy study.

Christopher A. Richard, BSN, RNChristopher A. Richard, BSN, RN, Nurse Manager

Joining McLean Hospital after almost 20 years working at Brigham and Women’s Faulkner Hospital Locked Psychiatric unit, Mr. Richard is experienced in the de-escalation and management of aggressive patient behaviors and trauma informed care. He also focuses on the education and training of program staff.

Hilary S. Connery, MD, PhD


Hilary S. Connery, MD, PhD, Clinical Director, Division of Alcohol and Drug Abuse

Dr. Connery’s expertise includes the treatment of opioid use disorders and co-occurring psychiatric and substance use disorders. She was a contributor to the APA Practice Guidelines for the treatment of substance abuse and is an investigator in the New England Consortium of the NIDA Clinical Trials Network. Dr. Connery is also the addiction psychiatry rotation director for the MGH/McLean Adult Psychiatry Residency Training Program.

Roger D. Weiss, MDRoger D. Weiss, MD, Senior Consultant

Currently chief of the Division of Alcohol and Drug Abuse, Dr. Weiss’ career has focused on treatment and clinical research with substance-dependent patients. He has authored over 300 publications, including several books, and is the recipient of numerous National Institutes of Health grants for developing integrated group therapy, as well as leading a multisite treatment study of prescription opioid dependence.

Shelly F. Greenfield, MD, MPHShelly F. Greenfield, MD, MPH, Senior Consultant

Dr. Greenfield is an addiction psychiatrist, clinician and researcher. Her research focuses on treatment, gender differences, and health services as relates to substance use. She is a recipient of National Institute on Drug Abuse (NIDA) funding for mentoring in substance use disorder patient-oriented research as well as for developing and testing a new manual-based group therapy for women with substance use disorders.

Staff and Associates

Our multidisciplinary team of clinicians and support staff includes board-certified addiction psychiatrists, licensed psychologists and family therapists, registered nurses, and mental health specialists. Working in close partnership with patients and families, we create and provide high-quality care tailored to each individual’s needs.

This well-trained team has extensive background in the treatment of substance use disorders and co-occurring mental health conditions. Our staff have experience working with patients from diverse cultural and socioeconomic backgrounds from across the country and around the world.

The Division of Alcohol and Drug Abuse is led by Roger D. Weiss, MD.