Background: Sir Reginald Carey "Rex" Harrison (5 March 1908 - 2 June 1990) was an English actor of stage and screen. Harrison began his career on the stage in 1924. He served in the Royal Air Force during World War II, reaching the rank of flight lieutenant. He won his first Tony Award for his performance as Henry VIII in the play Anne of the Thousand Days in 1949.
Context: Harrison's film debut was in The Great Game (1930), other notable early films include The Citadel (1938), Night Train to Munich (1940), Major Barbara (1941), Blithe Spirit (1945), Anna and the King of Siam (1946), The Ghost and Mrs. Muir (1947), and The Foxes of Harrow (1947). He was best known for his portrayal of Professor Henry Higgins in the 1964 film version of My Fair Lady, based on the eponymous Broadway production (which in turn was based on George Bernard Shaw's play Pygmalion), for which Harrison won a Best Actor Oscar. He also starred in 1967's Doctor Dolittle. At the height of his box office clout after the success of My Fair Lady, Harrison proved a domineering and demanding force during production, demanding auditions for prospective composers after musical playwright Leslie Bricusse was contracted and demanding to have his singing recorded live during shooting, only to agree to have it rerecorded in post-production. He also disrupted production with incidents with his wife, Rachel Roberts and deliberate misbehaviour, such as when he deliberately moved his yacht in front of cameras during shooting in St. Lucia and refused to move it out of sight due to contract disputes. Harrison was at one point temporarily replaced by Christopher Plummer, until he agreed to be more cooperative. He starred in the 1968 comedy The Honey Pot, a modern adaptation of Ben Jonson's play Volpone. Two of his co-stars, Maggie Smith and Cliff Robertson, were to become lifelong friends. Both spoke at his New York City memorial at the Little Church Around the Corner when Harrison died in 1990. Harrison was not by any objective standards a singer (his talking on pitch style he used in My Fair Lady would be adopted by many other classically trained actors with limited vocal ranges); the music was usually written to allow for long periods of recitative, or "speaking to the music". Nevertheless, "Talk to the Animals", which Harrison performed in Doctor Dolittle, won the Academy Award for Best Original Song in 1967. Despite excelling in comedy (Noel Coward described him as "The best light comedy actor in the world--except for me."), he attracted favourable notices in dramatic roles such as his portrayal of Julius Caesar in Cleopatra (1963) and as Pope Julius II in The Agony and the Ecstasy (1965), opposite Charlton Heston as Michelangelo. He also acted in a Hindi film Shalimar alongside Indian Bollywood star Dharmendra as well as appearing as an ageing homosexual man opposite Richard Burton as his lover in Staircase (1969).
Question: Who did he act with?. Whats the answer?
Maggie Smith and Cliff Robertson,