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Douglas Fairbanks Senior and his wife Mary Pickford.
According to Wikipedia, the correct answer is UA (United Artists).
In 1919, Charlie Chaplin formed United Artists with his closest friend Douglas Fairbanks and Fairbanks' wife, screen legend Mary Pickford - in a successful effort to keep the major studios from monopolizing and controlling all aspects of production. charlie-chaplin-reviews.info/biographies/biography-of-charlie-chaplin-the-little-tramp/
Douglas Fairbanks, Mary Pickford, Gloria Swanson, Charlie Chaplin, Buster Keaton, Stan Laurel, Oliver Hardy, W.C. Fields
In 1919, Charlie Chaplin formed United Artists with his closest friend Douglas Fairbanks and Fairbanks' wife, screen legend Mary Pickford - in a successful effort to keep the major studios from monopolizing and controlling all aspects of production.
Doulas Fairbanks
Wallace Beery, Charlie Chaplin, Douglas Fairbanks Sr., Mary Pickford, Buster Keaton, Al Jolson and others.
In 1910, he worked with the Fred Karno Repertoire Company. In 1913, he worked with Mack Sennett and the Keystone Film Company. Then he went to Essanay Company for more money and then Mutual Film Company. Then he joined with Mary Pickford, Douglas Fairbanks and D.W. Griffith to found the United Artists Corporation.
Born Gladys Smith, Mary Pickford was a very famous actress during the years of Charlie Chaplin's comedic movies and silent films. She started acting at age 14, and was casted and starred in many movies by director D.W. Griffith (The Birth of a Nation). She became so famous that her salary was too expensive for any film production to afford, so along with Charlie Chaplin, Griffith, and her husband Douglas Fairbanks, she confounded her own film studio, United Artists. Pickford became the first millionaire in the movie world. She was known as "America's Sweetheart" because of her beauty and lasting youth in films.
If you just want two... In the 1910s, Charlie Chaplin & Douglas Fairbanks In the 1920s, Greta Garbo & Buster Keaton
Charlie Chaplin, Jobyna Ralston, Brigitte Helm, Emil Jannings, Marie Mosquini, Douglas Fairbanks, Rudolf Klein-Rogge, Maly Delschaft, Conrad Veidt, Harold Lloyd, Georg John, John Barrymore
charlie chaplin black and white music title cards mary pickford rudolf valentino buster keaton