In 1946 Cooley was called to active duty with the Army Medical Corps. There, he served as chief of surgical services at the station hospital in Linz, Austria, and was discharged in 1948 with the rank of captain. He then returned to complete his residency at Johns Hopkins and remained as an instructor in surgery. In 1950 he went to London to work with Russell Brock. In the 1950s Cooley returned to Houston to become associate professor of surgery at Baylor College of Medicine and to work at its affiliate institution, The Methodist Hospital. During the 1950s, Cooley began working with American cardiac surgeon, scientist, and medical educator Michael E. DeBakey. During that time he worked on developing a new method of removing aortic aneurysms, the bulging weak spots that may develop in the wall of the artery. In 1960, Cooley moved his practice to St. Luke's Episcopal Hospital while continuing to teach at Baylor. In 1962 he founded The Texas Heart Institute with private funds and, following a dispute with DeBakey, he resigned his position at Baylor in 1969. He and his colleagues worked on developing new artificial heart valves from 1962 to 1967; during that period, mortality for heart valve transplants fell from 70% to 8%. In 1969, he became the first heart surgeon to implant an artificial heart designed by Domingo Liotta in a man, Haskell Karp, who lived for 65 hours. The next year, in 1970, "he performed the first implantation of an artificial heart in a human when no heart replacement was immediately available."
On March 13, 1972, the Denton A. Cooley Cardiovascular Surgical Society was founded at the Texas Heart Institute by the Residents and Fellows of Cooley to honor him. Founding President Philip S. Chua had envisioned this exclusive society to foster academic, professional and personal camaraderie among cardiac surgeons in the United States and around the world through scientific seminars and symposia. There are now more than 900 cardiac surgeons from more than 50 countries around the globe who are members of the Denton A. Cooley Cardiovascular Surgical Society. In the HBO film Something the Lord Made, Cooley was portrayed by Timothy J. Scanlin. Cooley filed for bankruptcy in 1988, citing real estate debts during a market downturn. Cooley and the heart surgeon Michael E. DeBakey had a professional rivalry that lasted more than 40 years. They made amends in a public rapprochement on November 7, 2007, when DeBakey was 99 years old (Cooley was 87). He died on November 18, 2016, at the age of 96. Source
Section E-2
Glenwood Cemetery
Houston
COORDINATES
29° 76.451, -095° 38.641





