In 1982, after completing his training, Dr. Glenn joined the faculty of Tufts University School of Medicine. In 1993, Dr. Glenn became Professor and Chairman of the Department of Rehabilitation Medicine at Boston University School of Medicine and Chief of Rehabilitation Medicine at Boston Medical Center. In 1998, he joined the Department of Physical Medicine and Rehabilitation (PM&R) at Spaulding Rehabilitation Hospital in Boston. He is Associate Professor in the Department of PM&R at Harvard Medical School. He is Massachusetts, Rhode Island, and National Medical Director of NeuroRestorative. He has published more than 60 peer-reviewed journal articles and book chapters.