[2] He graduated from Columbia College in 1925 and Johns Hopkins School of Medicine in 1929.
[2][3][4] He interned at Boston City Hospital and completed his residency at the Columbia University College of Physicians & Surgeons.
[2] Bruenn was transferred to Bethesda Naval Hospital, where he became chief of cardiology.
[5] He was one of the only three people present in Roosevelt's personal quarters in the Little White House when he died on April 12, 1945.
[2] Bruenn, a lifelong resident of Riverdale, Bronx, died on July 29, 1995, in his summer home in Sorrento, Maine at 90 years old.