Trinidadian-born actor and playwright who wrote Moon on a Rainbow Shawl (1958), for which he won The Observer's prize for best new playwright in 1957 and a Guggenheim fellowship in 1958.

John, a founding member of the Whitehall Players in Port of Spain, pursued his acting career from 1950 in London, where he found himself relegated to playing minor black characters, with the notable exception of his performance in the title role in Othello at the Old Vic Theatre (1962). His play Moon on a Rainbow Shawl, about a man's struggle to escape an impoverished Port of Spain slum, was produced first in London in 1958 and then revised for a production in New York City in 1962. It was later performed in such diverse countries as Iceland, Hungary, and Argentina, and it became required reading in many West Indian schools. His other plays included The Tout (1966) and Force Majeure, The Dispossessed, Hasta Luego: Three Screenplays (1967). For television he wrote The Emperor Jones (1953), Teleclub (1954), and Dawn (1963). He appeared on London stages in Salome (1954), The Merchant of Venice (1962), and Measure for Measure (1963), as well as in such films as The African Queen (1951), The Nun's Story (1959), and Guns at Batasi (1964).