AdvertisementHow A Team Of Elite Doctors Changed The Military's Stance On Brain TraumaJune 10, 2016Jon HamiltonfacebookEmailThe Gray Team with Maj. Jennifer Bell (center), who ran a concussion clinic, seen in the Helmand province of Afghanistan in 2010: Col. Michael Jaffee (from left) , Capt. James Hancock, Col. Geoffrey Ling, Lt. Col. Shean Phelps and Col. Robert Saum. (Courtesy of Christian Macedonia)