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St. John Greer Ervine (1883 - 24 January 1971) was an Irish author, writer, critic and dramatist. He wrote the plays Anthony and Anna in 1926 and The First Mrs. Fraser in 1929. He was born in Belfast, Ireland but moved to London while in his teens. His 1956 biography George Bernard Shaw was awarded the James Tait Black Memorial Prize.
A production of his tragedy, Mixed Marriage played at the Finborough Theatre from 4 to 29 October 2011, to critical acclaim.
Ervine died in London in January 1971, aged 87.