Michael Broder

Michael S. 35Broder, MD, MSHS


Dr. Michael Broder has more than 20 years’ experience in health economic and outcomes research. Dr. Broder received his research training in the Robert Wood Johnson Clinical Scholars Program at UCLA and RAND, attended medical school at Case Western Reserve University, and received his undergraduate degree from Harvard University. In addition to being an experienced health services researcher, he is a board-certified physician and provides clinical expertise for many studies at PHAR. Before starting PHAR, he served as Vice President of Zynx Life Sciences/Cerner Health Insights, a consulting and research firm in Beverly Hills, California. Dr. Broder has conducted research for industry, specialty societies, and government on a wide range of topics using diverse health service research methods. He has led expert panels to develop guidelines relating to use of estrogens, treatment of various cancers, surgical safety, and stroke prevention. He has published more than 50 articles in peer reviewed journals as wide-ranging as The Journal of the American Medical Association, American Journal of Managed Care, Medical Decision Making, Journal of Asthma, and Obstetrics & Gynecology. Dr. Broder is the author of two books and multiple book chapters. He is an Adjunct Professor at the Case Western Reserve School of Medicine, where he serves on the Council to Advance Human Health, and an Assistant Clinical Professor at the David Geffen School of Medicine at UCLA.


Eunice Chang

63Eunice Chang, PhD

Chief Statistician

Dr. Eunice Chang is a mathematician and statistician with more than 20 years’ experience in the application of statistical analysis and design in a range of data types, including longitudinal surveys; commercial, Medicare, and Medicaid claims; electronic health records; and many others. At PHAR, she leads many secondary data analyses, and provides methodological and statistical support on a variety of other project types. Before joining PHAR, she was Chief Statistician and Manager of Health Informatics and Health Outcomes Research at Prescription Solutions in Costa Mesa, California, where she was responsible for the methodology of retrospective and prospective clinical outcomes research and the evaluation of quality initiatives and disease-state management programs. This required the development of predictive models for pharmacy and medical costs and other healthcare utilization with data-mining techniques, such as regression models, decision trees, and neural networks. Dr. Chang also served as Senior Statistician at PacifiCare Health Systems, where she led a team focused on quality initiatives and health improvement projects, including the development of a systematic sampling program for HEDIS 1999 measures. Earlier in her career, she provided statistical support for research grant proposals and study design at the David Geffen School of Medicine at UCLA.


David BeenhouwerDavid 4Beenhouwer, MD

Medical Director

Dr. David Beenhouwer is board certified in internal medicine and infectious diseases. At PHAR, Dr. Beenhouwer provides expert clinical input, conducts systematic reviews, and collaborates on a wide variety of projects. He received his medical degree from Yale University and, after his residency at Columbia-Presbyterian Medical Center in New York, he completed a clinical and research fellowship in infectious diseases at Albert Einstein College of Medicine. In addition to his role as Medical Director at PHAR, Dr. Beenhouwer is an Assistant Professor of Medicine at the David Geffen School of Medicine at UCLA and an Infectious Disease Specialist in the VA Greater Los Angeles Healthcare System.


53Irina Yermilov, MD, MPH, MS

Senior Director, Outcomes Research

Dr. Irina Yermilov is a physician and researcher with expertise in using biometric, registry, and survey data to measure quality and cost. At PHAR, she oversees primary data collection studies (surveys and chart reviews), expert panels, and systematic literature reviews. Dr. Yermilov has worked with organizations such as IMS Health and the RAND Corporation to develop risk-adjusted quality measures, research the effects of quality improvement programs on chronic diseases, and investigate pregnancy outcomes following bariatric surgery. Her work has been published in multiple high-impact journals, including JAMA and the Journal of the American College of Surgeons. Dr. Yermilov earned her medical degree and master’s degree in public health from Tulane University. She also holds a master’s degree in physiology from Georgetown University.


srSheila 75Reiss Reddy, PhD, RPh

Director, Health Services Research

Dr. Sheila Reddy has nearly a decade of experience in pharmaceutical outcomes research, health economics, and evaluation, in addition to her years of practice as a pharmacist. She directs real world studies at PHAR, using administrative claims electronic health records, and survey data while drawing on her knowledge of patient care, study design, and quantitative research methods. Dr. Reddy has published her work in several peer-reviewed journals, including Medical Care and Health Services Research, and she has been an ad hoc reviewer for journals such as JAMA, Health Affairs, and the Journal of the Royal Statistical Society. Dr. Reddy also brings global health expertise, having supported multi-country program evaluations at the United Nations Children’s Fund and having organized public health projects in Cameroon as part of Peace Corps. Dr. Reddy received her pharmacy degree from the University of Wisconsin, with clinical training in transplant pharmacotherapy. She received both her master’s degree in global health and her doctorate in health policy from Harvard University.



22Tingjian (Jessie) Yan, PhD

Director, Health Services Research

Dr. Jessie Yan has extensive experience conducting observational studies in multiple therapeutic areas and has advanced statistical and programming skills in analyzing large, medical and pharmacy claims databases, Medicare and Medicaid data, and electronic health records. At PHAR, she designs and leads HEOR studies through retrospective analyses of existing administrative claims databases, in collaboration with clients from life sciences companies. Her work has been published in various peer reviewed journals, such as Journal of the American Geriatric Society, Neurology, and Stroke. Prior to joining PHAR, Dr. Yan worked as a Senior Researcher at HealthCore, Inc. She received her PhD in Gerontology from the University of Southern California and completed postdoctoral training in Health Services Research at the David Geffen School of Medicine at UCLA.


Jesse OrtendahlJesse 8Ortendahl, MS

Director, Health Economics

Jesse Ortendahl has a background in mathematics and statistics, and he has conducted disease simulation modeling for economic evaluations for over 15 years. At PHAR, Jesse conducts and oversees projects using quantitative and qualitative methodology, focusing primarily on cost-effectiveness and budget impact analyses, decision-analytic modeling, and health economics. His work at PHAR spans a range of clinical areas such as oncology, cardiology, pulmonology, mental health, and infectious diseases, among others. He was trained in health policy at the Harvard School of Public Health, with a focus on decision science. Jesse formerly served as a research analyst at the Center for Health Decision Science at the Harvard School of Public Health, conducting grant-funded research primarily on the cost effectiveness of different cervical cancer prevention strategies. He is an active member of the International Society for Pharmacoeconomics and Outcomes Research, and the Society for Medical Decision Making.


MarianneMarianne Eagan Burrows, M16Sc

Director, Operations

Marianne Eagan Burrows finished a Masters in International Health Policy from the London School of Economics in 2011 after receiving a bachelor’s degree in History of Science from Harvard University. At PHAR, Marianne oversees contracting, invoicing, and hiring, among other activities. Prior to joining PHAR, she assisted the International Planned Parenthood Foundation with field research for a social franchise initiative in Thika, Kenya, and spent eight months in Florida working as a field organizer during the 2012 Presidential election.


Sarah_border16Sarah Gibbs, MPH

Senior Researcher

Sarah Gibbs has extensive experience in quantitative and qualitative research and evaluation methods, project management, and data visualization. At PHAR, Sarah supports many projects, including chart reviews and systematic literature reviews. Prior to joining PHAR, Sarah worked as a Senior Research and Evaluation Analyst at the National Association of County and City Health Officials in Washington, DC, conducting primary research to support the work of local health departments across the United States. Sarah received her Master in Public Health from the University of North Carolina at Chapel Hill and a bachelor’s degree in psychology from Duke University.

Ryan TRyan22Tieu, MS


Ryan Tieu completed his undergraduate degree in Computational and Systems Biology at UCLA and graduate degree in Biostatistics at the University of Minnesota, Twin Cities. He primarily performs analysis on projects utilizing secondary data sources. Before joining PHAR, he was a biostatistician for the Regional Research Committee at Kaiser Permanente Southern California department of Research and Evaluation where he was responsible for development and analysis of physician driven research from across the region and from a variety of clinical areas. He has experience dealing with a range of data from electronic medical record to genomic databases, performing analysis in SAS, R, and Python.


68Eric Bell, MBA

Applications Developer

Eric Bell has worked in the pharmaceutical and medical devices field for 15 years, developing budget impact models, cost-effectiveness models, and Monte Carlo simulations as well as performing claims-based analysis using Excel, SAS, Delphi, R, and TreeAge. He has more than 30 years of experience writing software in a variety of contexts, including for avionics, text editing, device drivers, stock market trading, workflow management, databases, and database-driven web applications. With an undergraduate degree in mathematics, Eric combines a strong quantitative background and excellent software development skills with a focus on providing high-quality solutions designed to meet our clients’ business needs.


Jackie LeeJackie Lee, 5BS


Jackie Lee completed her undergraduate studies at the University of California, Los Angeles and received her degree in psychobiology.  At PHAR, she assists in conducting health economics studies, by programming cost-effectiveness and budget impact models and developing reports. Jackie also analyzes data for outcomes research studies, such as chart reviews and Delphi panels. Her other responsibilities include acquiring literature for systematic reviews and maintaining the PHAR reference database. She has previously worked at the UCLA Louise M. Darling Biomedical Library where she received training in literature searches using medical reference databases.


mtMarian Tarbox, M15PP

Research Project Manager

Marian Tarbox completed her undergraduate degree at the University of California, Davis and a Masters in Public Policy at Mills College. Prior to joining PHAR, Marian worked as a Grant Assistant for the Behavioral Health Department at The Children’s Clinic of Long Beach, where the focus of her work was increasing department efficacy and quality of care. At PHAR, Marian supports a variety of health services research projects including secondary data analyses and various other studies. As a research assistant, she is also responsible for the development and submission of a variety of dissemination pieces, including abstracts, posters, manuscripts, reports, and presentations.


Amanda_MG_7942_Web95Amanda Harmon, MPH


Amanda Harmon completed her undergraduate degree in Biology from Claremont McKenna College, then went on to receive a Master of Public Health with a concentration in Leadership and Management from Claremont Graduate University’s School of Community and Global Health. Before joining PHAR, Amanda worked as an emergency department scribe at Pomona Valley Hospital Medical Center, a Level II Trauma Center. At PHAR, Amanda is part of the Health Economics team. Amanda supports the conduct of cost-effectiveness and budget impact models, systematic reviews, and various other studies along with the development and submission of abstracts, posters, manuscripts, and presentations.


Sohum G16Sohum Gokhale, MPH


Sohum Gokhale completed his undergraduate degree in Public Health Sciences at the University of California, Irvine and his graduate degree in Epidemiology at UCLA. Prior to joining PHAR, Sohum was a research assistant at UC Irvine’s Heart Disease Prevention Program, where his work focused on cardiovascular disease risk related to hypertension. At PHAR, Sohum supports a variety of health services research projects at all stages, from data acquisition to development of reports, abstracts, conference posters, and manuscripts.



Nadeya_border11Nadeya Afredi, MPH

Research Assistant

Nadeya Afredi supports a variety of health services research projects at all stages, from data acquisition to development of reports, abstracts, conference posters, and manuscripts. She completed her undergraduate degree at the University of California, Los Angeles, and then went on to be a Community HealthCorps Member at The Children’s Clinic in Long Beach. Nadeya received her Master of Public Health with a concentration in Leadership and Management from Claremont Graduate University’s School of Community and Global Health, and completed her graduate level internship at the Los Angeles Best Babies Network. Prior to joining PHAR, she worked as a Quality Analyst at San Diego’s Father Joe’s Villages, a federally qualified health center.


1Hamzah Ahmed, BS

Research Assistant

Hamzah Ahmed completed his undergraduate studies at the University of California, Los Angeles and received his degree in psychobiology. Prior to joining PHAR, Hamzah was a research assistant at UCLA’s Semel Institute for Neuroscience and Human Behavior, where his work focused on resting-state functional MRI analyses in patients with DiGeorge syndrome. Hamzah also brings global health experience, having run public health projects in The Gambia, West Africa as part of the Peace Corps. At PHAR, Hamzah supports a variety of health services research projects at all stages, from data acquisition to development of reports, abstracts, conference posters, and manuscripts.