Clark served for three years in the
Merchant Navy (as an alternative to national service) as an
indentured apprentice on the
Silver Line ships
Silverwalnut and
Silvertarn. After leaving the navy he emigrated to
Toronto, Canada, to resume his career. Unknown in Canada, Clark became established as the original host of a weekly TV interview show
Junior Magazine on the
CBC's national network. He married Canadian actress
Kay Hawtrey (who was six years his senior) in 1956 and appeared on stage in the musical
Salad Days, seasons of
repertory in Toronto and
Ottawa, and acted in television dramas. Clark appeared in "The Browning Version" episode of
The DuPont Show of the Month/
Startime (1959–60). He became interested in a new approach to acting when he worked with
Luther Adler in Adler's touring American production of
A View From the Bridge. He moved to
New York City in 1960 and began a career on the American stage. In 1963, Clark starred in
The Lion in Love at One Sheridan Square. In 1966 he played a prison officer alongside
Ray Milland in the
Broadway production at the
Music Box Theatre of
Hostile Witness, under director
Reginald Denham. Clark met actress
Lynn Redgrave, a decade his junior, in November 1966 during a brief visit to London when he performed in ''What's Wrong with Humpty Dumpty?'', a television play in which she starred as a trendy antiques store owner with Clark as her very
gay assistant. When Redgrave came to New York, a friendship developed. He divorced Hawtrey in 1967, and she returned to her native Toronto with their son, while Clark remained in New York City and studied method acting with
Lee Strasberg, according to
Cindy Adams. On 2 April 1967, Clark and Redgrave were married in
Sidney Lumet's living room in New York City by an
Ethical Culture minister. The event was photographed for
Life Magazine by
Michael Crawford. At the time, she was appearing in her first
Broadway play,
Black Comedy, and he was appearing as the Earl of Warren
Off-Broadway in
Roy Levine's production of
MacBird!, which ran for 386 shows throughout 1967 and early 1968. In 1968, Clark appeared in the BBC Play of the Month on television,
Cyrano de Bergerac, opposite Eric Porter who played the leading role. ==1970s and 1980s==