- In 1995, won two Tony Awards for "Sunset Boulevard:" as Best Book (Musical) with Don Black, and as Best Original Musical Score, sharing lyrics credit with Black and music by Andrew Lloyd Webber. He previously has received two Tony nominations as author of Best Play nominees: in 1971 for "The Philanthropist" and in 1987 for "Les Liaisons Dangereuses."
- Member of the 'Official Competition' jury at the 43rd Cannes International Film Festival in 1990.
- He was awarded the 1974 Los Angeles Drama Critics Circle Award for Distinguished Playwriting for "Savages" at the Mark Taper Forum Theatre in Los Angeles, California.
- He was awarded the Knight Bachelor of the Order of the British Empire in the 2020 Queen's New Years Honours List for his services to Drama. He is playwright in Greater London W11, England.
- Is the father of two daughters, named Alice and Mary (aged 45 and 43, respectively, as of April 20th, 2020).
- As of 2022, he has contributed with the screenplay of three films that were nominated for the Best Picture Oscar: Dangerous Liaisons (1988), Atonement (2007) and The Father (2020).
- He was awarded the C.B.E. (Commander of the Order of the British Empire) in the 1999 Queen's Birthday Honors List for his services to literature.
- An Associate Member of RADA.
- Ranked #43 in the 2008 Telegraph's list "the 100 most powerful people in British culture".
- His play, "The Philanthropist", was awarded the 1975 Joseph Jefferson Award for Best Play Production with Swoosie Kurtz, Brian Murray, Peter Wexler (scenic designer), at the Goodman Theatre in Chicago, Illinois.
- Announced in 2000 that his adaption of Edith Wharton's novel The Custom of the Country would star Uma Thurman.
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