Rosqui's career as a professional actor began in 1951, when he appeared in St. John Terrell's Music Circus in Sacramento, appearing in a production of
Show Boat. He went on to appear in the national touring company production of
The Cocktail Party. While serving in the U.S. Navy he appeared in the
Actor's Workshop in San Francisco. After discharge he moved to New York, returning to San Francisco to appear in
Gift of Fury, a play by
Herbert Blau, who had headed the San Francisco Actors' Workshop with
Jules Irving. When Blau and Irving formed the
Lincoln Center Repertory Company, he was invited to join it, performing there for two years, appearing in
The Condemned of Altona and ''
Danton's Death''. ==Personal life==