Made her screen debut in 1935's No More Ladies billed as Joan Burfield; has also used the name Joan St. John.
She and Olivia de Havilland were the first sisters to win Oscars and the first ones to be Oscar-nominated in the same year, 1941 (Joan won for Suspicion and Olivia was nominated for Hold Back the Dawn).
Costarred with her mother in Ivy (1947) and The Bigamist (1953).
Autobiography No Bed of Roses was published in 1978.
Was vice-president of the Episcopal Actors' Guild of America.
Had a hole-in-one at both California's Cypress Point and Carmel Valley Golf Clubs.
Was a licensed interior decorator and a licensed pilot.
Was a recipient of the Eleanor Roosevelt Humanitarian Award.
1940, Oscar — Best Performance by an Actress in a Leading Role: Nominee
1941, Oscar — Best Performance by an Actress in a Leading Role: Winner
1943, Oscar — Best Performance by an Actress in a Leading Role: Nominee