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Health Services Research

Kristen Choi

Kristen Choi, PhD, MS, RN, is a child/adolescent psychiatric nurse and health services researcher. Dr. Choi studies health services and policy approaches to mental health, trauma, and violence among children, adolescents, and other vulnerable populations. Her current research projects include studies on Autism Spectrum Disorder, adverse childhood experiences, the impact of trauma and violence on nurses, and health system factors associated with firearm violence. Dr.

Michelle S. Keller

Dr. Keller is an Adjunct Assistant Professor in the Department in Health Policy and Management. Her primary appointment is at the Division of General Internal Medicine in the Department of Medicine at Cedars-Sinai Medical Center. Dr. Keller uses methods from epidemiology, behavioral economics, and sociology to examine how clinicians, patients, and caregivers make decisions about medications, surgeries, and treatment plans – and how informatics and health system interventions can be used to improve clinician decision-making.

Xi Zhu

Xi Zhu photo

Xi Zhu, PhD, is Associate Professor of Health Policy and Management at the UCLA Fielding School of Public Health. Dr. Zhu received his PhD in Sociology from the University of Minnesota. His research focuses on micro and macro organizational behaviors in healthcare delivery systems.

Michael Ong

Photo of Dr. Ong

Michael Ong, MD PhD, is a Professor in Residence of Medicine & Health Policy and Management at UCLA. He is Chief of the Hospitalist Division at the VA Greater Los Angeles Healthcare System. Dr. Ong is a practicing general internist. His research interests focus on improving the delivery of appropriate and efficient health care by general internal medicine physicians. His research has applied this focus in several areas of general medicine, including hospital-based care, mental health, and tobacco control. Dr.

Joann G. Elmore

Dr. Joann G. Elmore is a professor of health policy and management at the UCLA Fielding School of Public Health and of medicine in the Division of General Internal Medicine, in the Department of Medicine at the David Geffen School of Medicine at UCLA. She also serves as Director of the UCLA National Clinician Scholars Program. She is a national leader in academic general internal medicine and has a distinguished career as an investigator, mentor, administrator and educator. 

Isomi Miake-Lye

Isomi Miake-Lye is an Adjunct Assistant Professor in the Department of Health Policy and Management, and a researcher at the VA Greater Los Angeles Healthcare System. She has expertise in evidence synthesis, mixed methods research, implementation science, and organizational behavior. Her research focuses on how the organization of health systems affects the use of evidence and evidence-based practices. She is Associate Director of the VA Evidence Synthesis Program in West Los Angeles and teaches Program Evaluation courses at UCLA.

Risha Gidwani

Dr. Gidwani is a health economist whose research evaluates both the costs and health outcomes associated with healthcare services. Her work focuses on the impact of benefit design on quality of care and patient financial burden. She has been Principal Investigator on several grants aimed at studying the value of cancer care and/or end-of-life care. Dr. Gidwani uses a variety of methods to study the costs and outcomes associated with health service utilization, including techniques for causal inference from observational data and decision analysis. Dr.

Marissa Seamans

Marissa Seamans, PhD, MSPH, is an Assistant Professor in the Department of Epidemiology. Dr. Seamans’ research focuses on the intersection of social epidemiology and pharmacoepidemiology to address substance use and mental health. Her work explores the use of large healthcare databases to examine prescription drug use in families and the effectiveness of treatments for mental health and substance use disorders. Methodologically, Dr.

Yusuke Tsugawa

Yusuke Tsugawa, MD, MPH, PhD is assistant professor of health policy and management, as well as assistant professor of medicine at UCLA. Prior to joining the faculty at UCLA, he was a health specialist at the World Bank group and a research fellow at Beth Israel Deaconess Medical Center/Harvard Medical School. Dr. Tsugawa received his PhD in Health Policy from Harvard University with a concentration in statistics, and his MPH from Harvard School of Public Health.

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