At the Royal Court in August 1970, McCowen was cast to play the title role in Christopher Hampton's sophisticated comedy, The Philanthropist. If a philanthropist is literally someone who likes people, McCowen's Philip was a philologist with a compulsive urge not to hurt people's feelings – the inverse of Molière's The Misanthrope. Following enthusiastic reviews the production played to packed houses and transferred to the Mayfair Theatre where it ran for a further three years, making it the Royal Court's most successful straight play. McCowen and his co-star Jane Asher went with it to Broadway in March 1971 where he won the 1971 Drama Desk Award for Outstanding Performance.
