[1][2] He obtained his medical degree from the Columbia University Vagelos College of Physicians and Surgeons in 1933.

[2] Schroeder worked with Isaac Starr in developing the ballistocardiogram, a device used to detect abnormalities in cardiac function.

[2] In 1941, Schroeder was the first scientist to notice the importance of salt as compared to water in the management of congestive heart failure.

[3] Schroeder's major contribution to the prevention of chronic disease was his development of the low sodium diet which is used widely today in treatment of hypertension.

[4][5][6] The book documented the toxic effects of metals and the health impact of deficiencies of essential elements in the American diet.