By the time Fox had reached the age of twenty his apprenticeship had failed, leaving him to return to the family business. He toured for a while with Howard and his sister as L. Fox, playing minor dramatic and comedic roles. He left their company in 1850 to try his hand as a
low comedian at the
Bowery's National Theatre on Chatham Street. There he finally found his niche, becoming a popular headliner over the following seven years. For the remainder of his career Fox would play at venues that catered primarily to working-class audiences. In 1853, Fox directed and performed in his cousin's dramatization of ''Uncle Tom's Cabin'' at the National, starring Fox as Phineas Fletcher; his brother Charles as Gumption Cute; brother-in-law George C. Howard as Augustine St. Clair; sister Caroline as Eva St. Clair;
William J. Le Moyne as Deacon Perry; and Greene C. Germon as Uncle Tom. Inspired by the French ''
Commedia dell'arte'' artists, the Ravel Brothers, to undertake the British musical genre of
pantomime, he created a distinct place for that kind of entertainment in New York City, first at the National Theatre and later at the New
Bowery Theatre, of which he was for a time both lessee and manager in partnership with James R. Lingard. Fox continued to surround himself with an increasingly competent group of comedians and acrobats that included his brother Charles, who had become popular as an actor and a pantomime
Clown performer. Though often overlooked by the theater critics of the day, Fox's popularity in vaudeville houses at the time can be compared to that of
Edwin Booth's playing
Hamlet, a role that Fox played in a much lighter vein. ==Civil War==