Study Authors
    • Obstetrics and Gynecology
    • Environmental Epidemiology
    • Epidemiologic Methods
    • Sexual Health
    • Perinatal Epidemiology
    Jonathan Snowden, PhD, is an epidemiologist and an Assistant Professor in the Department of Obstetrics & Gynecology at Oregon Health & Science University (OHSU). Dr. Snowden is a leading expert in statistical methodology for analyzing large databases for clinically- and policy-actionable results, and his content focus is reproductive health. Dr. Snowden is a graduate of Stanford University and earned his PhD in epidemiology from the University of California, Berkeley. His policy experience includes service in the California State Legislature as a Senate Fellow, and his research experience includes working on CDC, HRSA, and NIH-funded studies domestically and internationally. His postdoctoral training at OHSU was supported by a career development award from the Eunice Kennedy Shriver National Center of Child Health and Human Development (NICHD). Dr. Snowden’s work has been published widely in leading medical and methodological journals, including BMJ, Epidemiology, and Obstetrics & Gynecology. He works at the interface of medicine, public health, and healthcare policy, analyzing healthcare systems factors to strengthen the evidence base for high-quality obstetric care. The broad goals of his research are: (1) to enable a safe delivery for every mother and baby (2) to close disparities and improve the health of racial minorities and sexual minorities. In addition to epidemiology, he implements cutting-edge tools from health policy, statistics, economics, and computer science in his inter-disciplinary research. He collaborates with leading clinician-scientists from the fields of obstetrics-gynecology, nurse-midwifery, and pediatrics, with the goal of accelerating the translation of health research in policy, clinical practice, and improved health outcomes.
  • Ellen Tilden, PhD, CNM, is an Assistant Professor in the School of Nursing at Oregon Health and Science University (OHSU). Dr. Tilden is a full-scope nurse-midwife with over a decade of clinical experience in a variety of settings domestically and internationally, in hospital and home settings. Dr. Tilden has been caring for healthy low-risk women in the nurse-midwifery group at OHSU for 12 years. Dr. Tilden earned her undergraduate degree from Reed College and completed her nursing and nurse-midwifery education at the University of California, San Francisco, earning an MS. Dr. Tilden earned her PhD in nursing at OHSU, where her dissertation focused on the impact of group vs. individual prenatal care on latent-labor hospital admission, cesarean delivery, and perinatal complications. She has published this research in leading midwifery and healthy birth journals, including the Journal of Midwifery and Women’s Health and Birth. Dr. Tilden is a health services researcher whose research focus is on healthcare systems factors that impact obstetric procedure use, particularly modifiable drivers of cesarean delivery. Her research approach is inter-disciplinary, employing tools from economics (e.g., cost-effectiveness analysis), causal inference (e.g., propensity scores), and other disciplines. She works collaboratively with epidemiologists, health policy analysts, and other clinician-scientists to generate translational obstetric research that will inform policy and clinical practice as relates to the care of medically low-risk women. Dr. Tilden is committed to applying the most rigorous methods available to answer high-impact questions in midwifery and obstetrics, making use of secondary data resources as well as prospectively collected primary data. Dr. Tilden’s postdoctoral research and training is supported by a career development award from the Eunice Kennedy Shriver National Institute Of Child Health & Human Development of the National Institutes of Health. Her overarching research goal is to define risk-appropriate care for healthy women and their children in the U.S. Such women make up a majority of women in the U.S., and Dr. Tilden aims to close evidence gaps in their care, enabling them to achieve optimal reproductive health throughout their lives.
    • Maternal and Fetal Medicine
    • Obstetrics and Gynecology
    • Prenatal Diagnosis
    • Obesity
    • Diabetes in Pregnancy
    • Preeclampsia
    • Post-term Pregnancy
    Associate Dean for Women’s Health Research and Policy, OHSU School of Medicine
    Associate Dean for Women’s Health Research and Policy, OHSU School of Medicine
    Dr. Caughey is the chair of the Department of Obstetrics and Gynecology and associate dean for Women’s Health Research and Policy, OHSU School of Medicine. He is nationally recognized as a dedicated clinician, accomplished educator and prolific researcher. In his clinical practice, Dr. Caughey has a special interest in diabetes in pregnancy. His research interests over the past decade have focused on utilizing a broad array of methodologies including standard biostatistical techniques as well as decision and cost-effectiveness analysis to address questions in obstetrics and maternal-fetal medicine regarding post-term pregnancy, preeclampsia, and diabetes in pregnancy, obesity and weight gain, as well as prenatal diagnosis. Dr. Caughey grew up in South King County in Washington, and trained in Boston and San Francisco. He recently returned to the Pacific Northwest and to OHSU, in particular, because of the opportunity to lead a talented department and to impact women’s health across Oregon. When he is not working, Dr. Caughey is usually playing with his children or spending time at the theater or concert hall (watching or performing).