WEARING A MASK IS STILL REQUIRED TO ENTER SUNNYBROOK. VISITORS AND PATIENTS MUST ALSO BE ASYMPTOMATIC & SHOULD BE FULLY VACCINATED. »

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Meet our team

Dr. Mark Greenberg
Addiction Medicine Physician – Lead Physician

Dr. Mark Greenberg is the Lead Physician of Sunnybrook’s RAAM Clinic. Dr. Greenberg has extensive experience in treating patients with Substance Use Disorder with expertise in Opioid Use Disorder. Dr. Greenberg is an Adjunct Lecturer in the Department of Family and Community Medicine and Department of Psychiatry at the University of Toronto.

Dr. Greenberg is a graduate of the University of Toronto, receiving a Bachelor of Science with Honours 1984 and Doctor of Medicine in 1988. He completed residency in Family and Community Medicine at Sunnybrook Health Sciences Centre in 1990.

In 1999, he received a certification in Addiction Medicine by the American Society of Addiction Medicine. In 2021, Dr. Greenberg received the Certificate of Added Competence from the College of Family Physicians of Canada in the domain of Addiction Medicine.

Over the past 30 years, Dr. Greenberg has been in full time private practice in Toronto, as well as Thunder Bay where he serves a large number of Indigenous patients.

Dr. Greenberg has served as Chief of the Department of Family and Community Medicine and President of the Medical Staff at the York Finch General Hospital. He has also served on the Methadone Committee at the College of Physicians and Surgeons of Ontario. Most recently he served on the Mental Health and Addiction sub-committee of the Premier’s Council to End Hallway Medicine.


Dr. Stephanie Zhou
Addictions Specialist Physician

Dr. Stephanie Zhou is the Addictions Specialist Physician at Sunnybrook’s RAAM Clinic.

Dr. Zhou completed her residency in Family Medicine at Sunnybrook Hospital and her MD/MSc jointly through the University of Toronto Faculty of Medicine and the Institute of Health Policy, Management and Evaluation.

Her interest in Addictions Medicine stems from clinical experiences at the Boston Healthcare for the Homeless program, St. Michael’s Hospital, Women’s College Hospital, and CAMH. Outside of her clinical work, Dr. Zhou is involved in medical education, through her work in Equity, Diversity and Inclusion, as well as with the financial aid office at UofT.


Lisa Orlandi
Nurse Practitioner

Lisa Orlandi (RN, FNP) is the RAAM Clinic’s Nurse Practitioner. Lisa graduated from the University of British Columbia (UBC) as a Registered Nurse in 2008 and as a Family Nurse Practitioner in 2014. She has worked in British Columbia as a Nurse Practitioner in primary care, with a focus in women’s health and addictions medicine.

After relocating to Toronto, she joined the RAAM clinic at Sunnybrook Hospital where she works closely with an interdisciplinary team to support patients with substance use disorders.


Tom Nguyen
Social Worker/ Addiction Counsellor

Tom Nguyen (MSW, RSW) is a Registered Social Worker, having completed his Bachelor of Science in Mental Health Studies and Master of Social Work at the University of Toronto. Tom is a social worker/addiction counsellor at Sunnybrook’s RAAM Clinic supporting patients on their journey to recovery.

Tom has extensive experience working with diverse patients facing mental health and substance use concerns arising from various situational challenges. He is sensitive to patients’ unique recovery experiences and aims to provide a safe space for individuals to explore their thoughts, feelings, and vulnerabilities related to their substance use.

His approach is grounded on a patient-centred, trauma-informed, and harm reduction framework that promotes safety, resilience, autonomy, empowerment, and connection in patient’s lives.


Deanna Smith
Addiction Counsellor

Deanna Smith (RP) is a Registered Psychotherapist with extensive experience working with individuals in various outpatient mental health and addiction settings. Deanna is an addictions counsellor at Sunnybrook's RAAM Clinic and works with individuals to support their goals related to substance use.

She offers person-centered counselling related to harm reduction, urge management, mindfulness, trauma-informed care, relapse prevention, and emotion regulation. Deanna brings clinical experience in a number of different modalities including, but not limited to Cognitive Behavioural Therapy, Dialectical Behavioural Therapy, and Motivational Interviewing.

Deanna enjoys approaching her work in a collaborative, authentic, non-judgmental and compassionate manner as a way to allow individuals to feel comfortable to explore possible changes with their substance use.​


Robert Brown
Peer Support Worker

Robert Brown is the RAAM Clinic’s Peer Support Worker. Through his personal experience, Robert brings empathy and understanding to his role to help support others.

Robert has completed peer-to-peer support worker training with the Ontario Peer Development Institute, as well as Hope + Me, where he has been facilitating meetings since 2018. Additionally, Robert facilitates meetings in the Mental Health and Addictions Unit at St. Joseph’s Hospital.

Robert’s greatest passion is helping people who have been through traumatic and stressful experiences.