Leó Szilárd
Feld was born in Brooklyn, New York. He graduated from the City College of New York with a bachelor of science degree in 1939. He began graduate school at Columbia University, but suspended his studies to join the American war effort. He spent the war serving as an assistant to Enrico Fermi and Leó Szilárd working on the Manhattan Project. After World War II, he returned to Columbia University to receive his PhD in 1945 with thesis advisor Willis Lamb.