From 1932 to 1934 he was a medical intern and assistant resident physician at Detroit's Henry Ford Hospital.
In 1934 he became an assistant in pathology and bacteriology at Manhattan's Rockefeller Institute for Medical Research.
[2] He did research on oncoviruses and the serology of tumors and experimental pathology of cancer.
[1] He discovered that a constituent in the blood of guinea pigs could cure laboratory mice in some cases of experimentally-induced tumors.
Kidd received in 1939 the Eli Lilly and Company-Elanco Research Award.