Leffingwell, Forrest Emmett was born on April 21, 1904 in Severy, Kansas, United States. Son of Howard Gordon and Etta (Warner) Leffingwell.
Bachelor of Arts, Union College, Lincoln, Nebraska, 1926. Doctor of Medicine Loma Linda U., 1933.
Intern, Glendale (California) Sanitarium and Hospital, 1932-1933. Private practice, Montebello, California, 1934-1940. Resident anesthesiology White Memorial Hospital, Los Angeles, 1940-1941, director department anesthesiology, 1946-1968.
Senior attending anesthesiologist Los Angeles County Hospital, 1955-1969. Professor anesthesiology, department chairman Loma Linda U., 1955-1966.
Served lieutenant colonel, Military Cross, Australia, 1941-1946. Member American (speaker house delegations 1953-1960, board directors 1950-1969, president 1961-1962), California (president 1949), societies anesthesiologists, American, California, Los Angeles County Medical associations, International Anesthesiology Research Society, International College Surgeons, Los Angeles Academy Medicine. Academy Anesthesiology, Alpha Omega Alpha.