The Institute for Advanced Study has appointed Arnold J. Levine, currently a visiting professor in its School of Natural Sciences, to a Professorship in the School from July 1. Levine�s research has centered on the causes of cancer in humans and animals. In 1979, Levine and others discovered the p53 tumor suppressor protein, a molecule that inhibits tumor development, and whose disruption is associated with many human cancers, including cancer of the breast, lung, liver, skin, prostate, bladder, cervix, and colon.