Core Investigators

Salomeh Keyhani MD, MPH


Dr. Keyhani is a Professor of General Internal Medicine at the University of California in San Francisco. She is also a staff physician and investigator at the San Francisco VA Medical Center. She is a practicing primary care internist and a health services researcher. Dr. Keyhani completed residency training in internal medicine and a fellowship in the Robert Wood Johnson Clinical Scholar program at Johns Hopkins. She received her Master’s in Public Health from the Johns Hopkins Bloomberg School of Public Health. She is currently leading multiple NIH funded cohort studies in multiple different topic areas including the effect of marijuana use on cardiovascular health.

Dr. Keyhani also has an active research program focused on health care policy research. She has surveyed physicians on their views regarding coverage expansions (the public option and Medicare expansions), defensive medicine, comparative effectiveness research and reimbursement reform. She has also examined the guideline development process and conflicts of interest in medicine.

To view Dr. Keyhani's complete UCSF profile, click here


 Beth Cohen MD, MA

Dr. Cohen is an internist and clinical investigator whose research focuses on health outcomes in patients with posttraumatic stress disorder. She is Principal Investigator of the Mind Your Heart Study, a prospective cohort study designed to examine the effects of posttraumatic stress disorder on cardiovascular health. 

To view Dr. Cohen's complete UCSF profile, please click here


Amy Byers PhD, MPH

Dr. Amy Byers is an Associate Professor of Psychiatry at the University of California, San Francisco (UCSF) and a Research Health Science Specialist at the San Francisco Veterans Affairs Health Care System (SFVAHCS). Dr. Byers is a clinical epidemiologist with a strong background in aging research and mathematical epidemiology. In particular, she has expertise in the evaluation of large, epidemiologic and administrative datasets [e.g., national probability samples, VA data, Centers for Medicare and Medicaid Services data, and national all-cause and cause-specific mortality data]. She joined the faculty at UCSF and the mental health research group at SFVAHCS in 2009; moving from a faculty position at Weill Cornell Medical College where she conducted research through the Weill-Cornell Institute of Geriatric Psychiatry. Since joining the UCSF/SFVAHCS faculty, Dr. Byers has largely devoted her career to the determination of nationally representative estimates related to psychiatric disorders, suicide and suicidal behavior, and health care utilization among older adults, with the goal of reducing the burden of late-life mental health and suicide. She has been funded by several agencies, including NIH (i.e., NIMH and NIMHD), Department of Defense, and VA.  Her work on late-life suicide in U.S. veterans has become more and more extensive, including her ongoing role as PI on the first VA R01-level grant longitudinally investigating suicide and suicidal behavior at a national level in older veterans and a NIMH R01 to study precursors of suicide in older veterans transitioning from prison to community. 


To view Dr. Byer's complete UCSF profile, please click here.



Katherine Hoggatt PhD, MPH


Dr. Hoggatt is a Research Health Science Specialist at the San Francisco VA Health Care System (SFVAHCS) and an Adjunct Associate Professor in the Department of Medicine at the University of California, San Francisco. In her previous position, Dr. Hoggatt served as a Research Health Scientist at the VA HSR&D Center for the Study of Healthcare Innovation, Implementation & Policy at VA Greater Los Angeles and an Adjunct Assistant Professor in the Department of Epidemiology at the Fielding School of Public Health, University of California, Los Angeles. Dr. Hoggatt's research focuses on understanding and ameliorating disparities in healthcare access and quality, improving care for women Veterans with substance use disorders (SUD), describing the epidemiology of SUD and related behavioral and mental health conditions in military and Veteran populations, and improving measurement of SUD care to enhance care quality and promote accountability.


Charlie Wray DO, MS


Dr. Charlie M. Wray, DO, MS is an Assistant Professor of Medicine at the University of California, San Francisco (UCSF), clincian, and Health Services Researcher at the San Francisco VA Medical Center. Dr. Wray completed medical school at Western University - College of Osteopathic Medicine, Internal Medicine residency at Loma Linda University Medical Center, and a Health Services Research Fellowship at tbe University of Chicago. Dr. Wray's reseach interests have focused on a variety of topics including: inpatient care transitions, care fragmentation in the hospital setting, overutilization of hospital resources, and the use of novel technologies to address social determinants in Veterans.


Additionally, Dr. Wray is an Associate Editor and Digital Media Editor for the Journal of Hospital Medicine (JHM) - where he established the use of Visual Abstracts and the Twittter-based journal club; JHMChat. Dr. Wray is also the Director of the JHM Editorial Fellowship. When not fulfilling these duties, Dr. Wray can often be found tweeting at @WrayCharles or trying to keep up with his two young boys.


To view Dr. Wray's complete UCSF profile, click here.