Richard Deyo

Clinical Investigator Emeritus

Dr. Deyo was the first person to hold the position of Kaiser Permanente Professor of Evidence-Based Family Medicine at Oregon Health & Science University, which entailed fostering community-based research collaborations between Kaiser Permanente and OHSU. In this position, which he held from 2007-2017, Dr. Deyo was a clinical investigator at CHR.

Dr. Deyo has a long-standing research interest in measuring patient function, involving patients in clinical decisions, and managing low back pain. He is a deputy editor of Spine, a member of the editorial board of Cochrane Back and Neck, and co-editor of the book Evidence-Based Clinical Practice: Concepts and Approaches.


Mary L. Durham, PhD

Senior Investigator Emeritus

From 1995 to 2016, Dr. Durham served as director of the Center for Health Research and vice president of research for Kaiser Permanente. In addition to her leadership roles, Dr. Durham conducted her own research on workplace health and translational research.

In tandem with her distinguished health research career, Dr. Durham worked with state and federal lawmakers in crafting policy-level decisions across a wide range of topics, such as privacy, mental health law, genetics, research, and human subjects protection. She consulted with and provided expert testimony to the President’s National Bioethics Advisory Commission, the World Health Organization, and the Association for Health Services Research (Academy Health), among many others. In addition, as an ambassador for Kaiser Permanente, she spoke to audiences around the world about the Kaiser Permanente health care model.

Dr. Durham was a professor in the Department of Public Health and Preventive Medicine at Oregon Health & Science University, and an adjunct professor in the Department of Sociology at Portland State University. She received her PhD in sociology from the University of Oklahoma in 1978, specializing in medical sociology. Before joining CHR, she was deputy director of Group Health Cooperative of Puget Sound’s Center for Health Studies and on the faculty at the University of Washington’s School of Public Health and Community Medicine, in the Department of Health Services.


Carla A. Green

Senior Investigator Emeritus

Dr. Green joined the Center for Health Research in 1998 and was a senior investigator from 2005-2015. A health services researcher, she focused on mental health and substance abuse services. She simultaneously held positions at Oregon Health & Science University, where she continues to serve as a clinical associate professor in the Department of Public Health. She also continues in a part-time role at CHR mentoring early-career investigators and working on projects related to opioid misuse, abuse, addiction, and overdose.

Dr. Green’s research included FDA-mandated, multi-site studies that examined risks — for example, misuse, abuse, overdose, and death — associated with use of opioid therapy for treating chronic pain. She most recently completed work on an NIMH-funded study to identify factors affecting preventive service use among patients with serious mental illnesses. Other projects included a study that successfully tested the efficacy of a weight loss program for patients taking antipsychotic agents (STRIDE) and a study that examined the effect of a tamper-resistant formulation of OxyContin on overdose rates.


Mitch R. Greenlick, PhD

Senior Investigator Emeritus

Dr. Greenlick was the director of the Center for Health Research from its founding in 1964 until July 1995. Beginning in 1984, he also served as vice president for research of nationwide Kaiser Foundation Hospitals. From 1990 to 2000, he was a professor and chair of the School of Medicine's Department of Public Health and Preventive Medicine at Oregon Health Sciences University (now Oregon Health & Science University).

Dr. Greenlick’s research activities have been in the areas of large-scale demonstration projects relating to the organization and financing of medical care and behavioral interventions to prevent disease and promote health. He was a co-principal investigator on the Medicare Prospective Payment Demonstration Project, which provided care to more than 7,600 Medicare beneficiaries on a capitation basis. He was the principal investigator on the Social/HMO project, which investigated the financial feasibility of providing a comprehensive range of long-term care services for the frail elderly. In addition to his work with large-scale demonstrations, Dr. Greenlick has had extensive experience in clinical trials, both at the local and national levels, and has provided leadership at the national level.

Dr. Greenlick received his PhD in medical care organization from the University of Michigan. He has served as research advisor to many projects throughout the country and as an advisor to several foreign government research and medical care projects. He was elected to the Institute of Medicine of the National Academy of Sciences when it was formed in 1971.


Donald Freeborn, PhD

Senior Investigator Emeritus

Dr. Freeborn served as associate director of CHR from 1970 to 1983 and as a senior investigator from 1970 to 1999. He has conducted studies on medical care utilization and costs, physician satisfaction, variation in practice patterns, effects of guidelines, and the performance of non-physician providers such as physician assistants and nurse practitioners. His research focuses on outcomes of substance abuse treatment and how substance abuse treatment affects medical care use and costs.

Dr. Freeborn received his doctoral degree in medical care organization from the University of Michigan. He also holds a master's degree in hospital administration from the Medical College of Virginia. Dr. Freeborn has served as a consultant for the Veterans Administration and its HSR&D Field Program and has served on various scientific committees for the Alcohol, Drug Abuse, and Mental Health Administration, the National Institute of Alcohol Abuse and Alcoholism, the NIMH, and the Institute of Medicine.


Chris Gullion, PhD

Senior Investigator Emeritus

Dr. Gullion is a consulting statistician who focuses on implementing new methodologies and on mentoring statisticians and other investigators. She has worked in a variety of content areas, including psychiatry and clinical psychology, neurology and brain imaging, diabetes, developmental disabilities, solid organ transplant, nephrology, and cardiology. Her methodological experience includes longitudinal outcome studies, randomized clinical trials, psychometric evaluation of symptom measures, and complex multivariate analyses.

Dr. Gullion received a PhD in quantitative psychology with a minor in developmental cognitive psychology from the University of North Carolina at Chapel Hill. Following a post-doctoral fellowship at the Biological Sciences Research Center and Center for Developmental Disabilities at UNC-CH, she joined the psychiatry faculty at the University of Texas Southwestern Medical Center as director of the Data Management and Statistics Core of a Mental Health Clinical Research Center. She also served as senior scientist in the Research Department at Medical City Dallas.


Mark C. Hornbrook, PhD

Senior Investigator Emeritus

Dr. Hornbrook, a health economist, is a recognized expert in research focusing on the determinants of medical care utilization, expenditures, economic burden, health outcomes, comparative effectiveness, and cost effectiveness. He was the Chief Scientist at the Center for Health Research and served on the Board of Directors of the Health Care Systems Research Network (formerly HMORN) since its founding. He also served on the Executive Committee of the Cancer Research Network.

Dr. Hornbrook has published in many areas, including cost and utilization analysis, illness episode grouping methods, economic evaluation methods, patient classification models, health status measurement, predictive modeling, and health-based remuneration systems. His work has produced nearly 200 peer-reviewed journal articles and book chapters.


John Mullooly, PhD

Senior Investigator Emeritus

When Dr. Mullooly joined CHR as a biostatistics investigator, his research in infectious disease epidemiology and vaccinations focused on vaccine effectiveness and vaccination policy issues that promoted their widespread use. His research demonstrated for the first time that influenza vaccination programs for the elderly, especially those at high risk, actually improved health for Kaiser Permanente members and produced a cost saving. It was an important contribution to Medicare's policy decision to cover the elderly for flu vaccinations.

Dr. Mullooly's work examined the potential side effects of certain vaccines, which have to be factored into the cost-benefit ratio of any vaccine, and overall vaccine cost effectiveness, in terms of illness and medical treatment. He later contributed as an investigator on studies of well-established childhood vaccines, adult immunizations, and cancer epidemiology.

Dr. Mullooly received his PhD in mathematical statistics from Catholic University of America.


Clyde R. Pope, PhD

Senior Investigator Emeritus

Dr. Pope is a sociologist and charter investigator at the CHR. He served as the CHR's associate director from 1984 to 1996. His areas of interest included the organization and delivery of medical care services; patient satisfaction; medical care use; health beliefs, attitudes, and behaviors; health status and medical care outcomes; mental health services; and aging and the care of the elderly.

Dr. Pope received his PhD in sociology from the University of Oregon.


Barbara G. Valanis, PhD

Senior Investigator Emeritus

Dr. Valanis is an epidemiologist specializing in cancer, occupational, and reproductive epidemiology and research on nursing roles in health care. She has led research studies focusing on how behavioral factors and racial differences affect cancer and occupational studies of back injury and anti-neoplastic drug exposures.

Her work has addressed methodological issues in screening and examined reproduction including relationships between social factors and birthweight, reproductive problems associated with work exposures, and the effects of drug use during pregnancy. Dr. Valanis led a major study on the cessation of prenatal/postnatal maternal smoking and relapse prevention. She also was the Portland Center principal investigator for the Carotene and Retinol Efficacy Trial, which evaluated beta carotene and selected vitamins in preventing lung cancer and was the principal investigator on the Women’s Health Initiative (WHI).

Dr. Valanis received her doctoral degree from the Columbia University School of Public Health. Prior to coming to the CHR in 1986, she was professor of nursing and associate professor of epidemiology at the University of Cincinnati.


Thomas M. Vogt

Senior Investigator Emeritus

As a student and then as a clinician, Dr. Vogt selected prevention as the nucleus of his research career at the Center for Health Research. His work has investigated improving prevention services in the medical care setting, the quality and costs of preventive care, primary care organization, and satisfaction with care across several states and multiple managed care systems. He has also studied the relation of personality to disease risk, cardiovascular disease, osteoporosis, and cancer in devising targeted approaches to reduce or prevent these diseases. 

From 1989 to 1997, Dr. Vogt directed CHR's epidemiology and disease prevention program in Portland before leaving to join the faculty of the Cancer Research Center at the University of Hawaii. He returned to CHR in 1999 to become the director of CHR's new Hawaii program. He stepped down from that role in 2007.

Dr. Vogt received his medical degree from the University of California, San Francisco, and an MS in public health from the University of California, at Berkeley. 

Follow Us