The story
The ADA was formally founded in 1939. It was founded by six physicians, including Herman O. Mosenthal, Joseph T. Beardwood Jr., Joseph H. Barach, Henry J. John, and E. S. Dillion, at the 1939 annual meeting of the American College of Physicians.
From Wikipedia’s article on American Diabetes Association, shared under CC BY-SA 4.0.4