Platt's first professional acting experience came in
stock theater in
Suffern, New York. She went on to act in stock productions "from Maine to Virginia to Minnesota". Her Broadway credits include
The Traitor (1949),
Anne of the Thousand Days (1948),
Five Alarm Waltz (1941),
In Clover (1937),
Promise (1936),
Spring Dance (1936), and
A Room in Red and White (1936). ,
John Wayne and Louise Platt in
Stagecoach (1939) Platt is best remembered for her role as the officer's pregnant wife in
John Ford's
Stagecoach (1939). After two years on Broadway, she came to
Hollywood in 1938. She returned to the New York stage in 1942 after acting in a half-dozen movies. She worked with
Rex Harrison in
Anne of the Thousand Days on Broadway in 1948 and in the 1950s played a variety of roles on television, including two appearances on
Alfred Hitchcock Presents and a recurring role as Ruth Holden on
The Guiding Light. == Personal life ==