Dr. Lennen is a native of Upstate New York. His undergraduate education was performed at Union College in Schenectady New York. His medical education was completed at Georgetown University Medical School and residency at Georgetown University Medical Center from 1988 to 1994 under a military scholarship program. His fellowship training in Total Joint and Adult Reconstruction was completed at Johns Hopkins University. He served active duty as a Major in the United States Air Force at the US Naval Hospital at Portsmouth, VA, where he participated in the training of Navy Orthopedic residents. Since 1998 he has been in private practice in Virginia, Florida, and now in Southern Maryland. He is proficient in General Orthopedic care as well as total joint and reconstruction of the hip and knee.