Dr. Rebar is a reproductive endocrinologist and obstetrician-gynecologist. Before assuming his current positions as Professor of Obstetrics and Gynecology, Western Michigan University Homer Stryker M.D. School of Medicine, Kalamazoo, Michigan and Adjunct Professor of Obstetrics, Gynecology, and Reproductive Biology, Michigan State University College of Human Medicine, Grand Rapids, he served as Executive Director of the American Society for Reproductive Medicine, the largest professional society devoted to reproductive medicine. He has a volunteer clinical appointment at the University of Alabama, Birmingham. Throughout his career, Dr. Rebar has been active in both basic and clinical research and has published extensively, with special interests in ovarian failure, hypothalamic forms of amenorrhea, and menopause.

Dr. Rebar wrote for NEJM Journal Watch General Medicine from 1998 to 2013 and served as a Contributing Editor from 2009 to 2013. He served as an Associate Editor for NEJM Journal Watch Women's Health from 2013 until the publication’s closure in 2020.

Information about Dr. Rebar was up to date at the time of his last affiliation with NEJM Journal Watch.