Louis M. (Louis Marshall) Warfield

Born in 1876, Louis M. Warfield — Louis Marshall Warfield — was an American physician whose writing centered on heart and vascular disease. Contemporary book records identify him as assistant superintendent and resident physician at Milwaukee County Hospital, and as an assistant professor of medicine at the Wisconsin College of Physicians and Surgeons.

He is best remembered for Arteriosclerosis and for Arteriosclerosis and Hypertension, with Chapters on Blood Pressure, medical works published in the early 20th century. These books reflect a period when physicians were working to better understand hardening of the arteries, circulation, and the clinical meaning of blood-pressure readings.

Warfield was also active in public health in Milwaukee. Later references describe him as a prominent physician and president of the Wisconsin Anti-Tuberculosis Association. He died in 1938, leaving behind work that offers a window into how cardiovascular medicine was being explained and practiced in his era.