Misha Black (born 1910 in Bacu, Russia died 1977) designed posters for London Transport 1936-1947. He was one of the most influential exhibition and product designers of his time. He designed posters from the age of seventeen. In 1928, he designed the stand for the Rio Tinto Company at the Seville Exhibition. This cover to the Cambridge magazine Experiment
is from the same year and must be one of his earliest published works. He was 18. The magazine was edited by William Empson, Hugh Sykes Davies, Humphrey Jennings and William Hare (Lord Ennismore) and Jacob Bronowski. See recent Man Ray post for an extract from it. He was later responsible for designing Westminster's iconic street name signs. He is covered on various design sites and at Wikipedia but information on his earliest work is sketchy.