UPC number 9 Trained in biochemistry at the University of Wisconsin, Madison, Dr. Litwack worked on enzymology and the effects of hormones on enzyme systems. Then he was a Postdoctoral Fellow of the National Foundation for Infantile Paralysis at the Biochemical Institute of the Sorbonne in 
Paris. Dr. Litwack's first position was as Assistant Professor of Biochemistry at Rutgers University in 1954. Six years later, he joined the University of Pennsylvania as associate professor and four years later went to the Fels Institute for Cancer Research and Molecular Biology, as full professor, eventually becoming Deputy Director of the Institute. In 1991, he accepted the Chair of Pharmacology at Thomas Jefferson University where he is also Deputy Director of the Jefferson Cancer Institute and Associate Director for Basic Science in the Jefferson Cancer Center. Dr. Litwack's work has been in the area of mechanisms of steroid receptor action involving especially the glucocorticoid and mineralocorticoid receptors, immunophi.