sentences:  Green was educated at The Haberdashers' Aske's Boys' School, in Elstree, Hertfordshire on a scholarship and left, aged 17, with four O-Levels.Contemporaries included David Elstein, the former head of Channel 5, and Nicholas Serota, director of the Tate Gallery.After working in public relations, Green went into business with his brother, founding the printing and direct mail firm Tangent Industries, making him a millionaire by the age of 21.