Edward Tatum
Ed Tatum was born in Boulder, Colorado. He attended college at the University of Chicago and received his PhD in biochemistry from the University of Wisconsin–Madison in 1934.  Starting in 1937, he worked at Stanford University, where he began his collaboration with Beadle.  He then moved to Yale University in 1945 where he mentored Lederberg.  He returned to Stanford in 1948 and then joined the faculty of Rockefeller Institute in 1957. A heavy cigarette smoker, he died in New York City of heart failure complicated by chronic emphysema.