He was an assistant at the University from 1921 to 1928, except for his postdoctoral study and research at the Ludwig Maximilian University of Munich under Arnold Sommerfeld, 1925 to 1926 on a Rockefeller Foundation Fellowship.
He served as a subordinate at the University from 1921 to 1928, with the exception of his postdoctoral study and research at the Ludwig Maximilian University of Munich under Arnold Sommerfeld, from 1925 to 1926 on a Rockefeller Foundation Fellowship.