Christopher Callahan, Regenstrief Institute (image) Indiana University Share Print E-Mail Caption Regenstrief Institute investigator Christopher Callahan, M.D. is the founding director of the Indiana University Center for Aging Research and the Cornelius and Yvonne Pettinga Professor in Aging Research at the Indiana University School of Medicine. Credit Regenstrief Institute Usage Restrictions Photo credit to Regenstrief Institute Share Print E-Mail 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.