Born in Hayling Island, England, on October 21, 1936, Gray attended Cambridge University and was an English lecturer for many years at Queen Mary, University of London. That privileged, literate setting provided the backdrop for many of his plays, including 1971's Butley, about a cynical English professor, and 1981's Quartermaine's Terms, perhaps his most famous play, about lonely teachers.
In recent months, Gray was working with a West End theater producer on a stage adaptation of The Last Cigarette, a show that may still happen, according to The Guardian. He also completed a final diary, which was due to be published later this year.
Gray is survived by his wife, Victoria of the prominent Rothschild family, and two children, Benjamin and Lucy, from his first marriage to Beryl Mary Kevern.