On this date Joshua Lederberg was born in Montclair, N.J. In 1947, he was appointed Assistant Professor of Genetics at the University of Wisconsin. He became an Associate Professor in 1950 and Professor in 1954. Lederberg was responsible for the organization the Department of Medical Genetics in 1957 for which he was department chairman for 1957-1958. In 1958, Lederberg was awarded the Nobel Prize for his studies of genetic structure and function in microorganisms. Lederberg has also been involved in artificial intelligence research as well as experimental NASA programs seeking life on Mars. Most recently, Joshua Lederberg is a Sackler Foundation scholar and professor-emeritus of molecular genetics and informatics at the Rockefeller University.