School of Medicine


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  • Joyce Njoroge, MD

    Joyce Njoroge, MD

    Clinical Assistant Professor, Medicine - Cardiovascular Medicine

    BioDr. Njoroge is a board-certified physician and fellowship-trained cardiologist with the Advanced Heart Failure Program at Stanford Health Care. She is also a clinical assistant professor of medicine in the Division of Cardiovascular Medicine.

    Dr. Njoroge has extensive clinical experience diagnosing and treating cardiovascular complications that develop during pregnancy or postpartum. She currently provides care at the Stanford Health Care Heart and Vascular Clinic with a particular focus on patients with a history of pregnancy-associated heart failure and cardiomyopathy.

    Dr. Njoroge’s research efforts involve identifying inherited genetic changes and biological markers that could help improve screening and care for pregnant women in higher risk populations. This includes determining the causes of disproportionately high incidences of heart-related complications and deaths experienced by Black women during and after pregnancy. Dr. Njoroge is also currently recruiting patients for a large-scale, multicenter clinical trial evaluating a drug to treat cardiovascular complications during pregnancy.

    Dr. Njoroge has published her work in numerous prestigious peer-reviewed journals, including Circulation Research and the Journal of Cardiac Failure. She also co-authored a chapter on cardiovascular disease in pregnancy in the most recent edition of the book Current Diagnosis and Treatment: Cardiology.

    Dr. Njoroge is a member of the Association of Black Cardiologists, the American College of Cardiology, the American Heart Association, and the Heart Failure Society of America.

  • Dale Gene O'Brien

    Dale Gene O'Brien

    Adjunct Clinical Assistant Professor, Medicine - Primary Care and Population Health

    BioDale O’Brien, MD, MPH is adjunct faculty at the Stanford University School of Medicine in the Primary Care and Population Health Division. He founded several medical clinics for vulnerable populations in under-resourced areas of northern California where he has been a practicing physician for more than four decades.

    A graduate of the University of Missouri School of Medicine, he took postgraduate training at the Oregon Health & Science University, and the University of California (San Francisco) / University of California School of Public Health. He is board certified by the American Board of Family Medicine and by the American Board of Preventive Medicine.

    Dr. O'Brien treated hippies at the White Bird Clinic in Eugene, Oregon in the mid-70s; served as the acting Health Officer of the Shasta County Health Department in California; and spent two years in the early 80s as an affiliate of the European Branch Headquarters of the World Health Organization in Denmark.

    As the Executive Director of the nonprofit Cancer Patients Alliance (CPA) since 2001, Dr. O’Brien and his team have advocated for and supported low-income Latino community members, immigrants and farm workers with cancer in the Salinas Valley agricultural region of Monterey County, California.

    Dr. O’Brien was Co-Principal Investigator of the Stanford Cancer Institute's Developmental Research Award in Translational Science, "Building an Academic-Community Partnership to Understand and Address Barriers to Cancer Care in the Salinas Valley Region of Monterey County," 2010 – 2015.

    CPA has trained a number of Stanford University medical and post-doctoral students on behalf of the Valley Fellowship Program beginning in 2010 until the present.

    Dr. O'Brien was a member of the Stanford / Medable team that developed the cancer aftercare app called TOGETHERCare - per NIH / NCI (SBIR 363) Phase 1 and 2 grants from 9/18/2017 until 9/30/2022.

    Dr. O’Brien was on the Stanford-based research team in 2018 that piloted and studied the efficacy of the “Healthkey” behavioral health app for SAMHSA, CDC and the Council of State and Territorial Epidemiologists.

    Beginning 2019, he was Co-Principal Investigator with the Stanford University group that has helped reduce cancer disparities by increasing access to the emerging DNA technologies - and facilitating cultural translation in Monterey County - pursuant to 4-year support from the California Initiative to Advance Precision Medicine.

    In 2021, CPA received a 5-year grant award from the Robert Wood Johnson Foundation to further their advocacy work with the Latino community and farm workers with cancer in the Salinas Valley.

    In June 2021, CPA was selected by the California GOTV medical academic consortium including the Stanford University School of Medicine as led by UCLA - to conduct the "Get Out the Vaccine to Stop Covid-19" initiative for low-income populations in Monterey County, California.

    Since 2016 Dr. O'Brien has been on the Institutional Review Board of Clinica de Salud del Valle de Salinas. He is currently a member of the Stanford Cancer Institute Community Advisory Board. Dr. O’Brien is a past editor of the Berkeley Wellness Letter, Medicine on the Net and Cancer Informatics.

  • Marily Oppezzo

    Marily Oppezzo

    Instructor, Medicine - Stanford Prevention Research Center

    BioMarily Oppezzo is a behavioral and learning scientist. She completed her doctorate in Educational Psychology at Stanford in 2013. She also is a registered dietitian and has her master's of nutritional science. She completed her dietetic internship at the Palo Alto Veterans Hospital, and currently consults as a sports dietitian for Stanford's Runsafe program. Her research interests leverage her interdisciplinary training, with a focus on how to get people to change to improve their health and well-being. Specifically, these areas include: using social media to motivate physical activity changes in those with or at risk for heart disease; culturally tailoring nutrition and physical activity recommendations and education materials for an Alaskan native population; how walking can be used to improve people's cognitive and creative thinking; and applying learning theories to medical education topics.