Pat O'Brien (born William Joseph Patrick O'Brien) was an American stage, screen, radio, and television actor. He was a star during the first several years of his film career, the height of his popularity being during the 1930s and 1940s.
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He was a prolific American actor who became a fixture of the studio system, widely known for his high-energy performances during the 1930s and 1940s.
He is primarily recognized for his roles in Angels with Dirty Faces, Knute Rockne, All American, and Some Like It Hot.
He appeared in a wide array of studio-era films, ranging from fast-paced crime dramas and war pictures to screwball comedies.
He had a long and significant association with Warner Bros., where he appeared in many of his most successful features alongside frequent co-star James Cagney.
