Born in York, England, in 1966, Kershaw attended University College, Oxford where he studied politics, philosophy and economics. He taught history at Whitgift school for two years before working as a journalist for several British newspapers, including The Guardian, The Independent and The Sunday Times. His journalism has appeared in many leading newspapers and magazines around the world. He has also worked as a writer and producer in television, penning an award-winning documentary on Bobby Kennedy. Several of his books have been optioned by Hollywood, including The Few which was selected as the Military Book Club's first-ever book of the year in 2006. His work has been translated into over a dozen languages. Kershaw appeared in the "Battle Of The Bulge" episode of When Weather Changed History. He is currently working on a book about the Allied liberation of Europe, titled 500 Days.