1949: He won the Academy Award for best supporting actor for his role in Twelve O'clock High.
(Source: IMDb)

1954: He played the beloved General Waverly in White Christmas.
(Source: Doug Macaulay)

1956: He refused to work with director Joseph Losey on a British science-fiction film, X the Unknown, because Losey was on the Hollywood blacklist. Losey was removed from the project after a few days shooting and replaced with Leslie Norman.
(Source: Nation Master Encyclopedia)

1964: He won an Emmy Award for his role as Principal Albert Vane on the TV series Mr. Novak. (He won again in 1965.)
(Source: Nation Master Encyclopedia)

1991: He died from heart failure in Santa Monica, California. He was one of the few actors ever to have his obituary printed in the Church News. He left his considerable collection of film memorabilia, papers, etc. to Brigham Young University.
(Source: LDS Film.com)

Trivia
He has a star on the Hollywood Walk of Fame for his contribution to motion pictures, at 1725 Vine Street.
(Source: Nation Master Encyclopedia)

Photos

Movie Poster for Brigham Young Frontiersman (1940) (Source: LDS Living)

In 1958, he lent his talents to the Elvis Presley film King Creole. He played the father of Elvis's character, Danny Fisher. (Source: Elvis’ costars: King Creole)