Marcus Hearn is the official biographer of Thunderbirds creator Gerry Anderson and author of the New York Times bestseller Doctor Who: The Vault. His other books include the award-winning The Art of Hammer, Saucy Postcards, The Avengers: A Celebration and Eight Days a Week, the story of The Beatles¿ final world tour. Marcus has written for The Times, The Guardian and The Independent, and has contributed booklet notes, audio commentaries and documentaries to nearly 100 DVDs and Blu-rays. He is an associate research fellow at Leicester De Montfort¿s Cinema and Television History Research Centre and is the official historian of Hammer Film Productions.