Olesya Baker is a Research Scientist at the Division of Health Policy and Insurance Research (HPI) at the Department of Population Medicine at Harvard Medical School and Harvard Pilgrim Health Care Institute. Prior to joining HPI in 2021, she worked in the Division of Health Policy within the Department of Emergency Medicine and also at the Center for Clinical Investigation, both at Brigham and Women’s Hospital, which is affiliated with Harvard Medical School. Her research has focused on evaluating impacts of policy changes on the availability, access to, and use of Emergency Department care. For example, her recent projects evaluated opioid prescribing behavior and prescribing guidelines from the ED using state-wide PDMP data. At HPI, she has been involved in studies of health insurance and health workforce policies. Olesya received her PhD in Economics from Boston University and completed her postdoctoral fellowship in the Division of Health Policy in the Department of Emergency Medicine at Brigham and Women’s Hospital. Her graduate training focused on areas of policy research and quasi-experimental methodologies.