Leonard Rowntree

That year William James Mayo saved his life by performing surgery on him for a perforated ulcer.

He recruited what became known as the "Rowntree group" to the Mayo Clinic including Norman Keith of Toronto, Samuel Amberg of Chicago, and Reginald Fitz of Boston, all of whom had been collaborators with his at Hopkins, and later Henry Helmholtz, George Brown, Walter Alvarez, Russell Wilder, Stanley McVicar, Albert M. Snell, Jay Bargen, Carl Greene, Philip Hench, Bayard Horton.

During his 12 years at the clinic, he published more than 100 articles, primarily in the fields of endocrine disease, water metabolism, and hepatology including the treatment of Addison's disease with adrenal extracts[8] and the radiological technique to xray the kidneys known as the intravenous pyelogram[9] Rowntree left the Mayo clinic in 1932 to continue his illustrious career in medicine as director of the Philadelphia Institute for Medical Research.

[14] The University of Western Ontario awarded him an honorary Doctor of Science degree in 1916 and established the annual Rowntree prize to the best essay on the history of medicine by a medical student.

In 1946, President Harry Truman awarded Rowntree the Medal for Merit for his work as chief of the medical division of the Selective Service System from 1940 to 1945.