Harvard Health Experts and Contributors

Margaret O'Connor, PhD, ABPP

Contributor

Dr. Margaret O’Connor holds a number of leadership positions in academic medicine and community settings. She is president-elect of the International Neuropsychological Society, a group whose mission focuses on promoting neuroscience and brain health initiatives across the world. As director of neuropsychology at Beth Israel Deaconess Medical Center in Boston, she coordinates the clinical work of a large staff and she has mentored over 80 students. In association with Dr. Alvaro Pascual Leone, she developed therapeutic programs to enhance memory, attention, and overall cognitive fitness through the Brain Fit Club. Dr. O’Connor is cochair of the Medical & Scientific Advisory Committee of the Alzheimer’s Association of Massachusetts, and she is on the board of directors for the Association. She is director of research for DriveWise, an evidence-based driving assesssment program that has provided road tests for over 700 people. She has been involved in a number of public forums and legislative initiatives on impaired driving, and she has produced videos to educate the public about this important topic. Dr. O’Connor is an associate professor of neurology at Harvard Medical School, where she has been engaged in teaching and research. With NIH and private foundation support, she conducted investigations of age-related memory loss, as well as changes in cognition that occur in the context of degenerative brain conditions. Her specific interests have to do with long-term retention of autobiographical and news events.

Elizabeth O'Donnell, MD

Contributor

Dr. Elizabeth O'Donnell is director of the Multi-Cancer Early Detection Clinic at Dana-Farber Cancer Institute, and an assistant professor of medicine at Harvard Medical School. She specializes in plasma cell disorders, with a particular interest in lifestyle medicine and patient and caregiver quality of life. She received her medical degree from Vanderbilt University and completed her residency in internal medicine at the Beth Israel Deaconess Medical Center, where she served an additional year as a chief resident. She completed her fellowship in hematology and oncology at Dana-Farber.

Michael O'Leary, MD

Contributor

Dr. Michael O’Leary is professor of surgery at Harvard Medical School and senior urologic surgeon at Brigham and Women’s Hospital, where he has practiced for 35 years. He is a graduate of Harvard College, and received his MD from George Washington University and a master of public health from the Harvard T.H. Chan School of Public Health. He completed his residency in urology at Massachusetts General Hospital, and was a Robert Wood Johnson Foundation Clinical Scholar at the University of California, San Francisco and Stanford University. He has authored over 200 publications.

Michelle O’Donoghue, MD

Contributor

Dr. Michelle O'Donoghue is the McGillycuddy-Logue Endowed Chair in Cardiology at Brigham and Women’s Hospital. She is also an associate professor of medicine at Harvard Medical School. Dr. O’Donoghue received her medical degree from Columbia University College of Physicians and Surgeons. She completed a residency in internal medicine and a cardiology fellowship at Massachusetts General Hospital and a master’s degree in public health from Harvard. Dr. O’Donoghue is board certified in cardiovascular disease. Her research focuses on managing acute coronary syndromes, including the study of new antiplatelet and lipid therapies, established and novel biomarkers, and heart disease in women.

Isioma D. Okolo, MBChB, MRCOG, DTMH

Contributor

Dr. Isioma D. Okolo is a Paul Farmer Global Surgery Research Fellow at the Program in Global Surgery and Social Change (PGSSC), and master of public health candidate at the Harvard T.H. Chan School of Public Health. She is also an obstetrics & gynaecology senior resident in the National Health Service in Scotland. Twitter: @isiokolo

Barbara Okun, PhD

Contributor

Barbara Okun, PhD, is a professor of counseling psychology at Northeastern University, a clinical instructor at Harvard Medical School, and a clinical psychologist and family therapist.

Nancy Oliveira, MS, RD, LDN, CDCES

Contributor; Editorial Advisory Board Member, Harvard Health Publishing

Nancy Oliveira is a registered dietitian and certified diabetes educator. She received a master of science in nutrition communications from Tufts University, and completed her clinical nutrition internship at Beth Israel Deaconess Medical Center. Currently she is manager of the nutrition and wellness service at Brigham and Women’s Hospital in Boston. In addition, she is the primary science writer at The Nutrition Source website from the Harvard T.H. Chan School of Public Health, and has co-authored chapters in nutrition textbooks. Her clinical focus with patients includes diabetes, gastrointestinal disorders including IBS and IBD, food sensitivities, and chronic disease prevention.

Rose McKeon Olson, MD, MPH

Contributor

Dr. Rose McKeon Olson is an associate physician in the department of medicine at Brigham and Women’s Hospital, and an instructor of medicine at Harvard Medical School. She has special research interests in trauma-informed care and the health impacts of gender-based violence.

Daniel Orr, PT, DPT, OCS, CSCS

Contributor

Daniel Orr is a licensed physical therapist and clinical supervisor at the Plymouth Outpatient Center of Harvard-affiliated Spaulding Rehabilitation Hospital. He earned his doctor of physical therapy from Boston University and is a board-certified orthopedic clinical specialist. His clinical interests are in orthopedics, sports‑related injuries, and postoperative rehabilitation.

T. Salewa Oseni, MD

Contributor

T. Salewa Oseni, MD, is a breast surgical oncologist at Massachusetts General Hospital Cancer Center. She specializes in breast oncoplastic surgery, and has an appointment as an assistant professor of surgery at Harvard Medical School. Her research areas include management of high-risk DCIS and health care disparities. Dr. Oseni received her undergraduate training at the University of Massachusetts, Lowell, and her medical degree from the Case Western Reserve University. Following this, she was commissioned as an officer in the United States Navy, and completed her general surgery training at the National Naval Medical Center in Bethesda, MD. She received her fellowship training in surgical oncology at Fox Chase Cancer Center in Philadelphia.

Andrew Oseran, MD, MBA

Contributor

Andrew Oseran MD, MBA is a clinical cardiology fellow at Massachusetts General Hospital. Dr. Oseran graduated from the University of Pennsylvania with a degree in economics in 2010. He received his MD from Georgetown University School of Medicine as well as a master’s in business administration (MBA) from the McDonough School of Business at Georgetown University. He completed his Internal Medicine Residency at Massachusetts General Hospital in 2019. His research interests include questions related to the delivery of health care and understanding how domestic policy initiatives impact health care outcomes and cost.

John W. Ostrominski, MD

Contributor

Dr. John W. Ostrominski is a fellow in cardiovascular medicine and an obesity medicine specialist at Brigham and Women’s Hospital and Harvard Medical School. His research focuses on cardiovascular-kidney-metabolic health, with specific interests in epidemiology, drug discovery, clinical trials, and health care delivery innovation. Dr. Ostrominski earned his medical degree from the Joe R. and Teresa Lozano Long School of Medicine at the University of Texas Health Science Center at San Antonio. He completed his internship and residency in internal medicine at Brigham and Women’s Hospital. He also served as a chief medical resident at the West Roxbury Veterans Affairs Medical Center, and holds a master’s degree in public health from the Harvard T.H. Chan School of Public Health.

Harvard Health Experts and Contributors

List of Experts

Margaret O'Connor, PhD, ABPP

Elizabeth O'Donnell, MD

Michael O'Leary, MD

Michelle O’Donoghue, MD

Isioma D. Okolo, MBChB, MRCOG, DTMH

Barbara Okun, PhD

Nancy Oliveira, MS, RD, LDN, CDCES

Rose McKeon Olson, MD, MPH

Daniel Orr, PT, DPT, OCS, CSCS

T. Salewa Oseni, MD

Andrew Oseran, MD, MBA

John W. Ostrominski, MD