Ruth Carroll was born Ruth Crombie Robinson in Lancaster, New York in 1899. She graduated from Vassar College and thereafter pursued training at the Art Students League in New York City. She started out as a fine artist - her work was exhibited in Newark and Pennsylvania in the 1920s - before she turned to children's book illustrations. From 1936 through the end of World War II, she had a staff position at King Features Syndicate.
In 1935 she took over the 'Just Among Us Girls' cartoon panel from Paul Robinson for a few months. She was succeeded by Walter Van Arsdale. Carroll took over the weekly 'Pussycat Princess' comics after the sudden death of it's creator Grace Drayton in 1936. She continued the strip with scripts by Ed Anthony until 1947. She illustrated over 36 children's books from 1932 to 1976 (often written by her husband Latrobe), and also did (cover) illustrations for magazines like The American Girl and St. Nicholas Magazine. She passed away in December, 1999 in Stamford, Connecticut.