As a member of National Research Council he moved temporarily for academic work with Heinrich Wieland in Munich before he returned to the States in 1931. On return he was approved as an assistant at The Rockefeller Institute for Medical Research. He remained with the Institute until 1948, becoming an Associate Member in 1937, and a Member in 1940. In 1948, he became Professor of Biochemistry at the University of California, Berkeley and built the Virus Laboratory and a free-standing Department of Biochemistry building, which is now called Stanley Hall.