Peter C. Nowell, MD, (born February 8, 1928) is a cancer researcher and co-discoverer of the Philadelphia Chromosome.He is currently the Gaylord P. and Mary Louise Harnwell Emeritus Professor of Pathology and Laboratory Medicine at the University of Pennsylvania.Nowell received his B.A. from Wesleyan University in 1948 and his M.D. from the University of Pennsylvania in 1952, where he joined the faculty in 1956. He served as chair of the department of pathology from 1967-1973, and as the first director of the University of Pennsylvania Cancer Center, now known as the Abramson Cancer Center at the University of Pennsylvania.He received Benjamin Franklin Medal in Life Science of The Franklin Institute 2010.