A pioneer in nuclear medicine and past president of the Society of Nuclear Medicine, Professor Henry N. Wagner Jr., MD has spent nearly five decades helping to define and promote the specialty. His groundbreaking work in the applications of nuclear medicine to pulmonary and coronary artery disease and his studies of brain chemistry with radio-labelled tracers have led to significant advances in these fields. Wagner is the director of the Division of Radiation Health Sciences at Johns Hopkins University in Baltimore, where he has worked since 1958. He is a professor emeritus of radiology and ra...