Paul Dudley White's residency at Massachusetts General Hospital was interrupted by World War I, where he served in the American Expeditionary Forces. He returned to his residency, where he was to become a pioneer in the diagnosis, treatment, and prevention of the diseases of the heart and circulatory system. As head of the hospital's cardiac clinic and laboratory, Dr. White laid the foundation for modern cardiology. He was a staunch advocate of proper diet, regular exercise, and weight control. Dr. White's work was popularized when he served as a consulting cardiologist when President Dwight D. Eisenhower suffered a coronary thrombosis while in office.