[1] Mosenthal was instructor at the Department of Biological Chemistry at Columbia's College of Physicians and Surgeons (1908–1914).

[1] In 1914, Mosenthal joined Johns Hopkins Medical School as associate professor of medicine.

The test involves urine specimens being measured through a twenty-four hour period of controlled dietary intake.

[2] In 1917, Theodore Caldwell Janeway left for service during World War I making Mosenthal Acting Professor of Medicine at Johns Hopkins until 1918.

[1] In 1940, Mosenthal was made Honorary Consulting Physician to the Division of Metabolism at New York Post-Graduate Medical School and Hospital.