Headshot photo of Leo L. Han, M.D., M.P.H.

Leo L. Han, M.D., M.P.H.

  • Associate Professor of Obstetrics and Gynecology, School of Medicine
  • Affiliate Associate Professor, Oregon National Primate Research Center


Leo Han, M.D., M.P.H. is an Associate Professor of Obstetrics and Gynecology. He completed medical school at Northwestern (2010), residency at the University of Colorado (2014), and fellowship here at OHSU (2017) with a Master’s in Public Health.  He currently is also a former Reproductive Science Development Program (RSDP) K12 scholar.

Dr. Han provides full spectrum obstetric and gynecologic care at the Center for Women’s Health, with a focus on family planning.

Dr. Han’s research spans a diverse range in reproductive health and family planning.  His primary research involves non-hormonal contraceptive discovery and understanding fertility regulation in the lower reproductive tract. In particular, he is interested in the cervix as a target for new contraceptive methods and has clinical, translational and basic science projects focused on studying the effects of progestogens and non-steroid modulators of mucus on the endocervix. He is also interested in the intersection of family planning and the internet, and understanding how digital information platforms influence the public perception of contraception and abortion care.  Dr. Han is the co-director of the resident research program at OHSU. 

Dr Han’s major research focus is in developing new, non-hormonal contraceptives.  His projects in contraception have led to collaborations with research scientists at the Oregon National Primate Research Center (ONPRC), the Population Council, University of North Carolina, and the World Health Organization (WHO). His current research is on regulation cervical mucus, specifically, defining the endocervix as a target for fertility regulation.

Education and training

    • M.D., 2010, Northwestern Center Feinberg School of Medicine
    • M.P.H., 2016, Oregon Health & Science University
  • Residency

    • University of Colorado in Denver
  • Fellowship

    • Family Planning 2017, Oregon Health & Science University

Memberships and associations:

  • American College of Obstetricians and Gynecologists
  • Reproductive Scientist Development Program
  • Society of Family Planning
  • Society for Reproductive Investigation
  • Society for the Study of Reproduction
  • American Society for Reproductive Medicine

Areas of interest

  • Reproductive Medicine
  • Family Planning
  • Contraception
  • Public Health


Elsevier pure profile

Selected publications

  • Han L, Andrews W, Wong K, Jensen JT. Conditionally reprogrammed macaque endocervical cells retain steroid receptor expression and produce mucus. Biol Reprod. 2020 May 26;102(6):1191-1202. doi: 10.1093/biolre/ioaa039. PMID: 32232331; PMCID: PMC7253786.
  • Han L, Padua E, Hart KD, Edelman A, Jensen JT. Comparing cervical mucus changes in response to an oral progestin or oestrogen withdrawal in ovarian-suppressed women: a clinical pilot. Eur J Contracept Reprod Health Care. 2019 Jun;24(3):209-215. doi: 10.1080/13625187.2019.1605503. Epub 2019 May 8. PMID: 31066303; PMCID: PMC6638556.
  • Han L, Padua E, Edelman A, Jensen JT. Appraising cervical mucus: a new approach to evaluating contraceptives. Eur J Contracept Reprod Health Care. 2018 Feb;23(1):78-83. doi: 10.1080/13625187.2018.1437134. Epub 2018 Feb 19. PMID: 29457758.
  • Han L, Saavedra-Avendano B, Lambert W, Fu R, Rodriguez MI, Edelman A, Darney B. Emergency Contraception in Mexico: Trends in Knowledge and Ever-Use 2006-2014. Matern Child Health J. 2017 Nov;21(11):2132-2139. doi: 10.1007/s10995-017-2328-6. PMID: 28699094.
  • Han L, Teal SB, Sheeder J, Tocce K. Preventing repeat pregnancy in adolescents: is immediate postpartum insertion of the contraceptive implant cost effective? Am J Obstet Gynecol. 2014 Jul;211(1):24.e1-7. doi: 10.1016/j.ajog.2014.03.015. Epub 2014 Mar 11. PMID: 24631431.


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