Research
In addition to my coaching practice, I’m an epidemiologist and Associate Professor at Harvard Medical School. My research focuses on improving sexual health through better access to HIV prevention medications.
The World Health Organization defines health as a state of complete physical, mental, and social wellbeing—not merely the absence of disease. That philosophy underlies both my population-level research and individual coaching practice.
Selected Publications
My research has been featured in the news media and has informed my essays on public health in The Atlantic. A complete list of my peer-reviewed publications can be found on my Google Scholar page, with selected research articles and commentaries listed below.
Original Research
Traeger MW, Leyden WA, Volk JE, Silverberg MJ, Horberg MA, Davis TL, Mayer KH, Krakower DS, Young JG, Jenness SM, Marcus JL. Doxycycline postexposure prophylaxis and bacterial sexually transmitted infections among individuals using HIV preexposure prophylaxis. JAMA Intern Med. 2025 Mar 1;185(3):273-81.
Krakower DS, Lieberman M, Marino M, Hwang J, Mayer KH, Marcus JL. Implementing an automated prediction model to improve prescribing of HIV preexposure prophylaxis. NEJM Catal Innov Care Deliv 2023;4(11).
Marcus JL, Sewell WC, Powell VE, Ochoa A, Mayer KH, Krakower DS. HIV preexposure prophylaxis and sexual satisfaction among men who have sex with men. Sex Transm Dis 2021;48(10):e135-7.
Jenness SM, Le Guillou A, Chandra C, Mann L, Sanchez T, Westreich D, Marcus JL. Projected HIV and bacterial STI incidence following COVID-related sexual distancing and clinical service interruption. J Infect Dis 2021;223(6):1019-28.
Marcus JL, Leyden WA, Alexeeff S, Anderson A, Hechter R, Hu H, Lam JO, Towner WJ, Yuan Q, Horberg MA, Silverberg MJ. Comparison of overall and comorbidity-free life expectancy between insured adults with and without HIV infection, 2000-2016. JAMA Netw Open 2020;3(6):e207954.
Marcus JL, Hurley LB, Krakower DS, Alexeeff SA, Silverberg MJ, Volk JE. Use of electronic health record data and machine learning to identify candidates for HIV pre-exposure prophylaxis: a modelling study. Lancet HIV 2019;6(10):e688-95.
Marcus JL, Levine K, Grasso C, Krakower DS, Powell V, Bernstein KT, Boswell S, Mayer KH. HIV preexposure prophylaxis as a gateway to primary care. Am J Public Health. 2018;108(10):1418-20.
Thought Leadership
Krakower DS, Marcus JL. Free the PrEP — over-the-counter access to HIV preexposure prophylaxis. N Engl J Med 2023;389(6):418-3.
Mayer KH, Traeger MW, Marcus JL. Doxycycline post-exposure prophylaxis and sexually transmitted infections. JAMA 2023;330(14):1381-2.
Krakower DS, Marcus JL. Commercial determinants of access to HIV preexposure prophylaxis. JAMA Netw Open 2023;6(11):e2342759.
Marcus JL, Killelea A, Krakower DS. Perverse incentives — HIV prevention and the 340B Drug Pricing Program. N Engl J Med 2022;386(22):2064-6.
Marcus JL, Krakower DS. Making PrEP easy. Lancet HIV 2022;9(4):e226-8.
Marcus JL, Katz KA, Krakower DS, Calabrese SK. Risk compensation and clinical decision making — the case of HIV preexposure prophylaxis. N Engl J Med 2019;380(6):510-2.
Marcus JL, Snowden JM. Words matter: putting an end to “unsafe” and “risky” sex. Sex Transm Dis 2019;47(1):1-3.
From Population Health to Personal Transition
My academic work focuses on improving health at a population level through research and policy, while my coaching practice focuses on the deeply personal transitions that individuals navigate at midlife and beyond. What motivates both of these roles is a desire to help people live healthier and more meaningful lives.
You can learn more about my coaching work on my Offerings page.