He went to
New York City in 1880 and worked as a sketch artist, when sheer chance turned him into an actor. He was living in a boarding house on 7th Avenue, where a number of theatrical people also lived, among them
Henry Miller, who eventually became his manager.
Osmond Tearle, an actor living there, heard from his own producer that an Englishman was needed for a production of
The School for Scandal. Tearle recruited Frederick, who got the part in January 1882 (which is also likely the moment he took the stage surname of "Kerr"). He appeared in several more plays in New York City that year, but left for Britain to appear in a London play in December 1882, after which he joined the company at the
Royal Court Theatre managed by John Clayton and
Arthur Cecil. Over the next fifty years, he travelled back and forth across the
Atlantic several times for theatrical work both in New York City and in London. and later managed the Royal Court Theatre. He starred in
Public Opinion at
Wyndham's Theatre in 1905 and also as the titular pirate in
George Bernard Shaw's ''
Captain Brassbound's Conversion'' at the Court Theatre in 1906. ==Film career==