Dr. Jarmain is board certified in physical medicine and rehabilitation and pain management. He focuses on nonsurgical care of spine disorders and performs spinal injections for diagnostic and therapeutic purposes throughout the entire spine. He completed a residency at Temple University/Moss Rehab Hospitals in Physical Medicine and Rehabilitation, followed by a Musculoskeletal/Spine Fellowship at Johns Hopkins University. Dr. Jarmain has also provided medical care and support for athletes, including teams at Johns Hopkins University, Philadelphia University, and the USA Golden Gloves Boxing team.

He has served as a staff physician at the Baltimore Marathon and at several Special Olympics events. Dr. Jarmain has co-authored many articles and chapters related to sports, spine, and pain management. He is a member of the American Academy of Physical Medicine and Rehabilitation, the North American Spine Society, the American Pain Society, and the American Society of Interventional Pain Physicians.