David Porter, University of Pennsylvania (IMAGE) University of Pennsylvania School of Medicine Caption This is David Porter, MD, director of Blood and Marrow Transplantation in the Abramson Cancer Center of the University of Pennsylvania. Credit Penn Medicine Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.