A. Tyl Hewitt, Ph.D., joined the staff of the DBGT Branch as a health scientist administrator in 1991. He was appointed as Branch Chief in August 1997. Prior to joining the DBGT Branch, he was on the faculty of the Wilmer Eye Institute at the Johns Hopkins University School of Medicine. His postdoctoral training in connective tissue biochemistry at the National Institute of Dental Research followed completion of his dissertation research at Emory University, which focused on changes in cell-surface properties during limb development. In addition to his duties as Branch Chief, he also serves as Acting Deputy Director of the Center for Developmental Biology and Perinatal Medicine (CDBPM).