Born in
Cincinnati, Ohio, Marion Leonard began her acting career in
live theatre, but at the age of 27 she started performing in the rapidly expanding film industry. She signed a contract in 1908 with the
American Mutoscope and Biograph Company and initially worked at that studio's production facilities in New York City, which were then located at 11 East 14th Street in
Manhattan. There she made her screen debut in
At the Crossroads of Life, a
short directed by
Wallace McCutcheon, Jr. and written by
D. W. Griffith, who also acted in that film and directed the vast majority of Leonard's other films at Biograph. Shortly after her screen debut, Leonard became one of the company's leading "photoplayers". At a time when
screen credits were not given to actors, she and
Florence Auer were the first star actresses to be billed by the studio as a "Biograph Girl". Among the many films Leonard made at Biograph, 32 of them were with an up-and-coming young actress named
Mary Pickford. ==Marriage and switch to Universal Pictures==