The CDPE strives to improve community health and safety by conducting research and outreach on best practices in drug policy. We work collaboratively with governments, affected communities, and civil society to guide effective and evidence-based policy responses to substance use.

The CDPE was founded as the International Centre for Science in Drug Policy (ICSDP) in 2010 at the BC Centre for Excellence in HIV/AIDS in Vancouver, Canada. The CDPE is now housed within the Li Ka Shing Knowledge Institute at St. Michael’s Hospital, a site of Unity Health Toronto, in Toronto, Canada.

The CDPE endeavors to be a primary source for rigorous scientific evidence on the impacts of illegal drug policy on community health and safety. To that end, the CDPE produces research products that adhere to the highest standards of peer-reviewed scientific research. The CDPE also conducts outreach and knowledge translation to inform policymakers, affected communities, key stakeholders, and the general public on pressing current issues surrounding illegal drugs and drug policy. The CDPE also leads innovative primary research, including on drug checking services, supervised injection services, injection drug use prevention, overdose response, and drug policy evaluation.

Our Team

Dr. Dan Werb
Executive Director

Dan Werb, PhD, is an epidemiologist and policy analyst with expertise in HIV, addictions, and drug policy. Dr. Werb is a Research Scientist at St. Michael’s Hospital in Toronto, and holds a dual appointment as Assistant Professor in the Division of Infectious Diseases & Global Public Health at the University of California San Diego and in the Institute of Health Policy, Management & Evaluation at the University of Toronto. He is also Affiliate Assistant Professor in the Division of AIDS at the University of British Columbia. Dr. Werb is an inaugural winner of the U.S. National Institute on Drug Abuse Avenir Award (2015) for creative new investigators proposing highly innovative research at the intersection of HIV and substance use. This award supports his work as Principal Investigator of PRIMER: Preventing Injecting by Modifying Existing Responses, a five-year multi-site cohort study tasked with developing interventions to preventing entry into injection drug use.

Dr. Werb is the recipient of a Trailblazer Award (2017) from the Canadian Institutes of Health Research. He conducts extensive knowledge translation on drug policy and public health, through print and radio journalism, and is the winner of a 2014 Canadian National Magazine Award for his popular science writing. Finally, he was profiled in April 2017 as one of 13 young Canadians making a difference as part of the CBC series ‘We Are Canada’ ( His general interest non-fiction book about Tijuana’s femicide, City of Omens, will be published in 2019 (Bloomsbury Publishing).

Zachary Bouck
Research Associate

Zachary Bouck is a Research Associate at the CDPE, where he assists with study design, data analysis and interpretation of findings. Zach has prior experience working as a biostatistician at Women’s College Hospital, where the majority of his research involved the use of administrative data to study physician and system-level characteristics associated with use of low-value care. His interest at CDPE is studying persons who inject drugs (PWID) within the Ontario integrated Supervised Injection Site (OiSIS) prospective cohort to identify characteristics associated with providing injection initiation assistance to injection-naive individuals. He is currently a PhD in Epidemiology at the Dalla Lana School of Public Health at the University of Toronto and holds a Masters of Public Health from the University of Saskatchewan.

Dr. Jeanette Bowles
Postdoctoral Fellow

Dr. Jeanette Bowles is a Postdoctoral Fellow with the CPDE where she is working on evaluation efforts of injectable opioid agonist/safer supply programs at frontline sites throughout Toronto, and hospital-based interventions for persons who use drugs. She is a long-time harm reduction advocate, mostly having worked throughout Philadelphia, Puerto Rico, and San Diego, CA. Her focus is on community-engaged research in the arena of drug use and sex work/trade. She holds a doctorate degree in Public Health from Drexel University’s Dornsife School of Public Health. During the time at Drexel, Dr. Bowles taught graduate and undergraduate courses for both Drexel and the University of Pennsylvania, where she had previously earned a Master of Social Work degree and worked in HIV risk-reduction research. Dr. Bowles’ dissertation was entitled “Opioid Overdose Among Persons Who Inject Drugs in Philadelphia: Witnessed Overdose Responses, Prevention Program Diffusion, and Environmental Risks.” Following successful defence of her dissertation, she accepted an NIH-funded T32 Postdoctoral Scholarship at the University of California San Diego.

Sufiat Fusigboye
Research Assistant

Sufiat Fusigboye is a Research Assistant at CDPE.  Her work includes supporting the capture-recapture method to estimate the population size of people who use drugs in Ontario. She will also be aiding the linkage of participants’ self-reported questionnaire data from an ongoing longitudinal cohort of people who use drugs in Toronto with routinely collected administrative data. Sufiat completed a Master of Public Health at Queen’s University. Prior to that, she completed a Bachelor of Science majoring in biology and minoring in global development studies at Queen’s University. Her research interest includes women’s health, global health, and health equity research.

Zoë Greenwald
Research Assistant

Zoë Greenwald is a Research Assistant at the CDPE. She is an epidemiologist contributing to diverse projects stemming from a longitudinal cohort of people who use drugs in Toronto, including the impact of the COVID-19 pandemic on health care utilization among participants. Zoë is currently pursuing her PhD in Epidemiology at the Dalla Lana School of Public Health, University of Toronto, and holds a Master of Science in Epidemiology and a Bachelor of Arts & Sciences from McGill University. Her research interests lie in infectious disease epidemiology (particularly the treatment and prevention of Hepatitis C, HIV and other sexually transmitted and blood borne infections), harm reduction, and health disparities research.

Dr. Gillian Kolla
Postdoctoral Fellow

Dr. Gillian Kolla is a Postdoctoral Fellow at the CDPE. She uses community-based qualitative and ethnographic research to examine how to make health and social services more accessible to people who use drugs. Dr. Kolla’s doctoral research at the Dalla Lana School of Public Health, University of Toronto, explored how the criminalization of drug use impedes the ability of public health programs to respond effectively to drug use. She is currently also conducting postdoctoral research at the Canadian Institute for Substance Use Research at the University of Victoria, and is a member of the coordinating committee for the Toronto Overdose Prevention Society, which opened and ran Ontario’s first supervised injection site in Moss Park as a volunteer initiative in 2017-2018 as part of a community-led response to overdose deaths.

Nazlee Maghsoudi
Manager, Policy Impact Unit

Nazlee Maghsoudi is the Manager of the Policy Impact Unit at the CDPE, having formerly acted as Knowledge Translation Manager. She has been deeply involved in the development of evidence-based drug policies at the grassroots, local, national, and international levels since 2013. Nazlee is Chairperson of the Executive Committee of the New York NGO Committee on Drugs, a global committee that supports civil society engagement on drug policy at the United Nations and represents 100+ organizations. She is also a Strategic Advisor at Canadian Students for Sensible Drug Policy, having formerly acted as Chair of the Board of Directors. Nazlee is a PhD candidate in Health Services Research at the Institute of Health Policy, Management and Evaluation at the University of Toronto, and holds a Bachelor of Commerce from Queen’s University and a Master of Global Affairs from the University of Toronto.

Karen McDonald
Operations Manager

Karen McDonald is the Operations Manager at the CDPE. She provides strategic leadership to ensure objectives are met and facilitates the CDPE’s growth. Karen is responsible for stakeholder management and is accountable for the financial portfolio and programmatic reporting of the organization. Karen leads the implementation of Toronto’s drug checking service, as well as the planning and implementation of other CDPE initiatives. She brings over ten years of public sector experience, where she has contributed to health policy and systems change. Karen holds a Master of Public Policy, Administration and Law from York University and is a certified project management professional.

Liz McLean
Research Assistant

Liz McLean is a Research Assistant at the CDPE, responsible for community outreach and conducting interviews with people who use drugs for the Integrated Supervised Injection Services Evaluation. Liz has lived experience and is deeply embedded in Toronto’s harm reduction community. She has extensive experience providing services to people who use drugs and undertaking community-based research through Parkdale Queen West Community Health Centre and the University of Toronto.

Dr. Claudia Rafful
Policy Analyst

Dr. Claudia Rafful MSc, PhD is a Policy Analyst at the CDPE. As a policy analyst, Dr. Rafful is investigating access to health care among people who inject drugs (PWID) in North America, with a special focus on access to HIV treatment and prevention services and injection drug use initiation. Her main interest is on developing evidence-based public policy recommendations to improve the access to healthcare among vulnerable populations, including people with substance use disorders and other mental disorders. She holds a PhD in Public Health from the University of California. Her research and training has been funded by the Secretariat of Health in Mexico, the Mexican National Council of Science and Technology (CONACyT), UC-Mexus, Fogarty International, and the Canadian Institutes of Health (CIHR).

Indhu Rammohan
Research Assistant

Indhu Rammohan is a Research Assistant at the CDPE, where she assists the team in interpreting study-related data. Indhu developed an interest in harm reduction and drug policy during her undergraduate training in global health. She co-founded the University of Toronto Chapter of the Canadian Coalition for Global Health Research, which aims to promote health equity by facilitating knowledge translation and collaboration between students and researchers in global health. She was also involved in the University of Toronto International Health Program where she played a key role in organizing U of T World AIDS Day 2015 and wrote for the UTIHP Editorial. Indhu is currently pursuing a MSc in Health Services Research, in the Health Policy concentration, at the Institute of Health Policy, Management and Evaluation at the University of Toronto.

Kristy Scarfone
Research Assistant

Kristy Scarfone is a Research Assistant with the CDPE where she is supporting the evaluation of Toronto’s Drug Checking Service. She is currently pursuing a Doctor of Pharmacy (PharmD) degree at the Leslie Dan Faculty of Pharmacy at the University of Toronto, and has a Bachelor of Science in Biopharmaceutical Sciences with specialization in Medicinal Chemistry from the University of Ottawa. She combines her knowledge of analytical and synthetic chemistry with her aim to improve public health through proactive and preventative health care in her work with the CDPE. Kristy’s research interests include harm reduction and health equity surrounding addiction, with specific interest in persons who use drugs in rural communities within Northern Ontario

Dr. Ayden Scheim
Associate Scientist

Dr. Ayden Scheim is an Affiliate Scientist with CDPE and Co-PI of the Ontario Integrated Supervised Injection Services cohort study in Toronto (OiSIS-Toronto). Previously, as a postdoctoral researcher with CDPE, he led a program of systematic reviews on drug policy and harm reduction interventions. Dr. Scheim is currently an Assistant Professor of Epidemiology and Biostatistics at the Drexel University Dornsife School of Public Health in Philadelphia and an Adjunct Assistant Professor of Epidemiology and Biostatistics at Western University. He holds a PhD in Epidemiology and Biostatistics (2017) from Western University and was a Canadian Institutes of Health Research and Pierre Elliott Trudeau Foundation Postdoctoral Fellow at the University of California, San Diego.

Hayley Thompson
Project Manager, Toronto’s Drug Checking Service

Hayley Thompson is the Project Manager of Toronto’s Drug Checking Service at the CDPE. She is responsible for managing the day to day operations of the drug checking pilot, including fostering robust relationships with partners and working with the harm reduction community to optimize the service. Hayley’s previous project management experience has focused on implementation and quality improvement for primary, acute, and long-term care organizations nationally. Hayley has a Bachelor of Arts in Communications from Wilfrid Laurier University, a postgraduate certificate in international business management from Mohawk College, and is currently pursuing a Master of Health Science in Health Administration at the Institute of Health Policy, Management and Evaluation at the University of Toronto.

Bijan Rafat
Research Coordinator

Bijan Rafat is a Research Coordinator at the CDPE. He is responsible for coordinating the activities related to two studies: PRIMER – a multi-national study that aims to identify whether specific interventions and factors influence the risk that individuals begin injecting drugs and national SOS – a study that evaluates the safer opioid supply pilot programs that have been implemented across Canada. Bijan has been involved in research related to opioid use and in cannabis research including a study that focused on the evaluation of the role of cannabis in reducing opioid use in chronic pain patients. His experience includes designing and coordinating randomized-controlled trials and observational studies. He holds a Master of Science in Pharmaceutical Sciences from the University of Toronto.

Heather McLean
Research Assistant

Heather McLean is a Research Assistant at the CDPE, responsible for community outreach and conducting interviews with a longitudinal cohort of people who use drugs in Toronto. Heather has experience in early phase clinical research with INC Research and Syneos Health, where she specialized in first in human substance use studies as the screening unit administrator and first point of contact for participants. Before Syneos closed their Toronto clinic, Heather was training in their screening results department. She also has extensive experience in telephone research where she most recently was a team leader, which involved training a group of 65 interviewers and editing the collected data to be inputted into the transportation database. Heather graduated from Central Technical School.

Anaita Kharwanwala
Administrative Assistant

Anaita Kharwanwala is an Administrative Assistant at the CDPE. Her responsibilities mainly involve supporting the Executive Director and the administrative function of the Centre. She supports the team in their various projects, including the implementation of Toronto’s Drug Checking Service, tracking knowledge translation activities, managing the Centre’s website and social media presence, and other communications activities. Anaita graduated with a Bachelor of Arts from the University of Ottawa and completed her Post-Graduate Certificate in Human Resources Management from Humber College.


Dr. Alexander Caudarella
Clinical Lead

Dr. Alexander Caudarella is a substance use physician and family physician. He is currently the interim medical director for Addictions at St. Michael’s Hospital. He is a previous member of the Ontario opioid task force and a current member of the TAHSN/TPH opioid joint task force. His areas of interest include innovative program development for substance use care in hospitals and low resource areas.  He makes frequent appearances in English and French media to promote improved substance use care.  Dr. Caudarella has extensive experience in substance use having worked in BC, Ontario and Nunavut as well as ongoing international work.

Dr. Akwasi Owusu-Bempah
Racial Equity Lead

Dr. Akwasi Owusu-Bempah, PhD, is a criminologist and sociologist who studies race, inequality and social policy. He is an assistant professor in the Department of Sociology at the University of Toronto and a Senior Fellow at Massey College. He holds Affiliate Scientist status at the Centre for Addiction and Mental Health and serves as Director of Research for the Campaign for Cannabis Amnesty. Dr. Owusu-Bempah began his academic career in the United States at Indiana University, Bloomington. Prior to becoming a professor, he held positions with Canada’s National Judicial Institute, the Public Health Agency of Canada, and the Ontario Ministry of the Solicitor General. He is frequently sought out to provide commentary and advice to public and private sector agencies, community organizations, and media outlets on a variety of topics.

Dr. Saadia Sediqzadah
Clinical Researcher

Dr. Saadia Sediqzadah (she/her) is a Clinical Researcher at CDPE, where she is performing a cost-effectiveness analysis on injectable opioid agonist treatment from the economic perspective of the Ontario healthcare sector. Dr. Sediqzadah is a psychiatrist and clinician-investigator in the Department of Psychiatry at St. Michael’s Hospital and the University of Toronto. She specializes in community mental health outreach, where she provides care to people living with severe and persistent mental illness who are either experiencing homelessness or live in Toronto community housing. She is also employed by Inner City Health Associates, where she provides psychiatric care to youth shelters. She recently completed her Master’s of Science in Health Policy and Management at the Harvard TH Chan School of Public Health.

Scientific Board

A Scientific Board comprised of leading international scientific experts on drug policy and related disciplines oversees the work of the CDPE.

  • Dan Werb, PhD
    Chair of the Scientific Board; Executive Director, Centre on Drug Policy Evaluation
  • Chris Beyrer, MD, MPH
    President, International AIDS Society
  • Don C. Des Jarlais, PhD
    Director, International Research Core in the Centre for Drug Use and HIV Research, New York University College of Nursing
  • Gordon Guyatt, MD, MSc
    Distinguished Professor, Department of Clinical Epidemiology & Biostatistics, McMaster University
  • Catherine Hankins, MD, MSc
    Deputy Director of Science, Amsterdam Institute for Global Health Development, Department of Global Health, Academic Medical Center, University of Amsterdam
  • Carl L. Hart, PhD
    Director Residential Studies and Methamphetamine Laboratories, New York State Psychiatric Institute
  • Michel D Kazatchkine, MD
    Member of the Global Commission on Drug Policy, Geneva
  • Thomas Kerr, PhD
    Co-Director, Urban Health Research Initiative, British Columbia Centre for Excellence in HIV/AIDS
  • Julio Montaner, MD
    Director, British Columbia Centre for Excellence in HIV/AIDS
  • David J Nutt, MD, FMEDSCI
    Edmond J Safra Professor of Neuropsychopharmacology, Division of Brain Sciences Imperial College London
  • Steffanie A Strathdee, PhD
    Associate Dean, Global Health Sciences; Harold Simon Professor and Chief of the Division of Global Public Health, University of California San Diego School of Medicine
  • Evan Wood, MD, PhD
    Professor of Medicine, Division of AIDS, University of British Columbia

Technical Advisors

The CDPE’s Technical Advisors are experts from a variety of disciplines relevant to drug policy who help to ensure that all research produced by the CDPE adheres to the highest scientific standards by providing peer review for publications.

Frederick Altice | Apinum Aramrattana | Judith Auerbach | Tasnim Azim | Aram Barra | Francisco Bastos | David Bewley-Taylor | Ricky Bluthenthal | Scott Burris | Patrizia Carrieri | Paul Dietze | Benedikt Fischer | Samuel Friedman | Sandro Galea | Holly Hagan | Robert Heimer | Margaret Hellard | Adeeba Kamarulzaman | Jan “Jano” Klimas | Alex Kral | Lisa Maher | Thomas Patterson | Tim Rhodes | Alison Ritter | Jeffrey Samet | Lisa Sánchez | Susan Sherman | Ambros Uchtenhagen | Alex Wodak