This biography is the end result of many decades writing about the Beatles as a journalist, and I owe a debt of gratitude to many people who helped me along the way. They include Pete Best, Tony Bramwell, Peter Brown, Tony Calder, Maureen Cleave, Rod Davis, Hunter Davies, Lil Evans, Anthony Fawcett, Bill Harry, Ronnie Hawkins, Freda Kelly, Mark Lewisohn, Mike McCartney, Sir Paul McCartney, Thelma McGough, Barbara O’Donnell, Yoko Ono, May Pang, Dan Richter, Fred Seaman, ‘Mimi’ Smith, Ringo Starr and Pauline Sutcliffe. Sadly, some are no longer with us, but all are fondly remembered. They include Neil Aspinall, Tony Barrow, Ray Coleman, Mal Evans, Dick James, Cynthia Lennon, Linda McCartney, Sir George Martin, Harry Nilsson, Derek Taylor and, of course, John Lennon.