The son of journalist Rudolph Lehmann, and brother of actress Beatrix Lehmann and novelist Rosamond Lehmann, he was educated at Eton and read English at Trinity College, Cambridge, his time at both of which he considered "lost years". After a spell as a journalist in Vienna, he returned to England to found the popular periodical in book format, New Writing (1936-1941) which proved of great influence on literature of the period, and an outlet for writers such as Christopher Isherwood and W. H. Auden.
After joining Leonard and Virginia Woolf as managing director of Hogarth Press between 1938 and 1946 he created his own firm John Lehmann Ltd with his sister Rosamond, publishing new works by authors such as Sartre and Stendhal, and discovering talents like Thom Gunn and Laurie Lee.
In 1954 he founded The London Magazine, remaining as editor until 1961, following which he was a frequent lecturer, and completed his three volume autobiography, Whispering Gallery (1955), I Am My Brother (1960), The Ample Proposition (1966). He also wrote the biographies Edith Sitwell (1952), Virginia Woolf and Her World (1975), Thrown To The Woolfs (1978) and Rupert Brooke (1980).
At first sight the tall, stooped figure with the hawk-like features and bloodless cheeks, the look of extreme gravitas, seems forbidding and austere, the abbot of an ascetic order, scion of an imperial family who has foresworn the world.
-- JohnLehmann, "T.S. Eliot Talks About Himself and the Drive to Create",
And we want to tell our readers about sharp, clever books, utterly lacking in gravitas, that we know will delight them on the beach or the bus.