Dan Werb




Dan Werb, PhD, is an epidemiologist and policy analyst with expertise in overdose, Human Immunodeficiency Virus (HIV), addictions, and drug policy. Dr. Werb is a Research Scientist at the Li Ka Shing Knowledge Institute (LKSKI) at St. Michael’s Hospital in Toronto. He is also an Assistant Professor in the Division of Infectious Diseases & Global Public Health at the University of California, San Diego. Dr.Werb is Director of the Centre on Drug Policy Evaluation, a recognized global leader in cutting edge policy research and communications. Dr. Werb has published dozens of studies on issues related to health policy and addictions, with a focus on preventing the transition of street youth into injection drug use, as well as on identifying the impact of policy and public health interventions on street-based drug-using populations.

Please note: Dr. Werb is not taking any summer students.


Recent Publications

  1. Scarfone, KM, Maghsoudi, N, McDonald, K, Stefan, C, Beriault, DR, Wong, E et al.. Diverse psychotropic substances detected in drug and drug administration equipment samples submitted to drug checking services in Toronto, Ontario, Canada, October 2019-April 2020. Harm Reduct J. 2022;19 (1):3. doi: 10.1186/s12954-021-00585-2. PubMed PMID:35012557 PubMed Central PMC8748183.
  2. Bouck, Z, Tricco, AC, Rosella, LC, Ling, V, Gomes, T, Tadrous, M et al.. Validation of self-reported opioid agonist treatment among people who inject drugs using prescription dispensation records. Epidemiology. 2021; :. doi: 10.1097/EDE.0000000000001443. PubMed PMID:34799473 .
  3. Maghsoudi, N, Tanguay, J, Scarfone, K, Rammohan, I, Ziegler, C, Werb, D et al.. Drug checking services for people who use drugs: a systematic review. Addiction. 2021; :. doi: 10.1111/add.15734. PubMed PMID:34729849 .
  4. Bowles, JM, McDonald, K, Maghsoudi, N, Thompson, H, Stefan, C, Beriault, DR et al.. Xylazine detected in unregulated opioids and drug administration equipment in Toronto, Canada: clinical and social implications. Harm Reduct J. 2021;18 (1):104. doi: 10.1186/s12954-021-00546-9. PubMed PMID:34645480 PubMed Central PMC8511847.
  5. Meyers-Pantele, SA, Jain, S, Sun, X, Marks, C, DeBeck, K, Hayashi, K et al.. Gender and the first-time provision of injection initiation assistance among people who inject drugs across two distinct North American contexts: Tijuana, Mexico and Vancouver, Canada. Drug Alcohol Rev. 2021; :. doi: 10.1111/dar.13390. PubMed PMID:34636100 .
  6. Bowles, JM, Jain, S, Sun, X, Strathdee, SA, DeBeck, K, Milloy, MJ et al.. Investigating a bidirectional relationship between overdose and provision of injection initiation assistance among persons who inject drugs in Vancouver, Canada and Tijuana, Mexico. Int J Drug Policy. 2021;95 :103398. doi: 10.1016/j.drugpo.2021.103398. PubMed PMID:34390966 PubMed Central PMC8530890.
  7. Marks, C, Meyers, SA, Jain, S, Sun, X, Hayashi, K, Gonzalez-Zuniga, P et al.. Involvement of people who inject drugs in injection initiation events: a cross-sectional analysis identifying similarities and differences across three North American settings. BMJ Open. 2021;11 (8):e046957. doi: 10.1136/bmjopen-2020-046957. PubMed PMID:34385244 PubMed Central PMC8362731.
  8. Marks, C, Bouck, Z, Jain, S, Sun, X, Strathdee, SA, Vickerman, P et al.. The impact of recent homelessness on the provision of injection drug use initiation assistance among persons who inject drugs in Tijuana, Mexico and Vancouver, Canada. Drug Alcohol Depend. 2021;225 :108829. doi: 10.1016/j.drugalcdep.2021.108829. PubMed PMID:34237582 .
  9. Kitchen, SA, McCormack, D, Werb, D, Caudarella, A, Martins, D, Matheson, FI et al.. Trends and outcomes of serious complications associated with non-fatal opioid overdoses in Ontario, Canada. Drug Alcohol Depend. 2021;225 :108830. doi: 10.1016/j.drugalcdep.2021.108830. PubMed PMID:34182376 .
  10. Scheim, AI, Sniderman, R, Wang, R, Bouck, Z, McLean, E, Mason, K et al.. The Ontario Integrated Supervised Injection Services Cohort Study of People Who Inject Drugs in Toronto, Canada (OiSIS-Toronto): Cohort Profile. J Urban Health. 2021;98 (4):538-550. doi: 10.1007/s11524-021-00547-w. PubMed PMID:34181179 PubMed Central PMC8237772.
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Affiliations & Other Activities

  • Assistant Professor, Division of Global Public Health, University of California San Diego Director, International Centre for Science in Drug Policy