After receiving his medical degree from Washington University in 1942, Sutherland served as a World War II army physician. Sutherland returned to Washington University in 1945, where he continued to do research in Cori’s Laboratory. Sutherland accredits his decision to pursue a research career, as opposed to entering the medical profession, to his mentor Cori. Sutherland held various teaching titles during his time at the Washington University School of Medicine, including instructor in pharmacology (1945–46), instructor in biochemistry (1946–50), assistant professor in biochemistry (1950–52), and associate professor in biochemistry (1952–53). In 1953, Sutherland moved to Cleveland, Ohio for a position as a professor of pharmacology and chairman of the department of pharmacology at the school of Medicine at Case Western Reserve University (formerly,Western Reserve University).There, he collaborated with Theodore W. Rall, also a professor of pharmacology, who was to become a lifelong research partner. Together, they conducted further research on the mechanism of hormone action at the molecular level. During his ten years at Case Western Reserve University, Sutherland made several ground-breaking discoveries that led to the identification of Cyclic adenosine monophosphate, or cyclic AMP, and its role as a secondary messenger.