MG Brian Lein grew up in New York and attended the United States Military Academy. He graduated in 1984 as a Distinguished Military Cadet with a Bachelor of Science, and was commissioned a Second Lieutenant in the Medical Service Corps. He then attended Temple University School of Medicine in Philadelphia. He graduated in 1988 as an Alpha Omega Alpha Scholar with an MD degree. He completed his Internship in General Surgery at Madigan Army Medical Center in 1989. He completed his Residency in General Surgery at Abington Memorial Hospital in 1993. He is board certified in general surgery.
MG Lein's military education includes graduation from the AMEDD Officer Basic and Advanced Courses, the U.S. Army Command and General Staff College, the U.S. Army War College and the U.S. Army Airborne School.
Following commissioning in the Regular Army, MG Lein served as a General Surgeon in 2d General Hospital/Landstuhl Army Regional Medical Center. During this assignment he was assigned to the 67th Forward Surgical Team (Airborne) and deployed to Bosnia-Herzegovina in support of Operation Joint Endeavor. His next assignment was as Chief of General Surgery, William Beaumont Army Medical Center. There he was PROFIS to the 31st Combat Support Hospital (Caretaker) as the Chief of Surgery. During this time he was also assigned to Joint Special Operations Command as a general surgeon. His next assignment was as the Division Surgeon, 4th Infantry Division (Mechanized). He served on the Army Surgeon General Panel for Objective Force Redesign for Medical Force Structure. In 2003, he graduated from the U.S. Army War College. He then served as Commander, Evans Army Community Hospital, Fort Carson, Colorado. His next assignment was Command Surgeon, Coalition Forces Land Component Command/U.S. Army Central/Third Army. He then served as Commander, Landstuhl Regional Medical Center. He also served as Command Surgeon, U.S. Army Forces. During this assignment, MG Lein deployed in support of Operation Enduring Freedom as Command Surgeon, ISAF Joint Command, from February to May 2012. His most recent assignment was as the Deputy Surgeon General and Deputy Commanding General, Operations, U.S. Army Medical Command.
MG Lein's awards and decorations include the Legion of Merit (2OLC), Bronze Star Medal, Defense Meritorious Service Medal, Meritorious Service Medal (2OLC), the Army Commendation Medal (2OLC), the Joint Service Achievement Medal, Army Achievement Medal, GWOTEM and GWOTSM, Overseas Ribbon, NATO Medal, the Army Parachutist Badge, the Joint Superior Unit Award, the Army Superior Unit Award, the Order of Military Medical Merit and the German Sports Badge (Gold).