Before moving into a career in journalism, he attended grammar school, then studied history at the University of Sussex.
Apparently unchastened, or motivated by the outpouring of support for her side of the story that came with the book's publication, Diana later talked to Morton again when his publisher Michael O'Mara decided to release a sequel to the publishing blockbuster, titled Diana: Her New Life. This also topped the best-seller lists in the UK and US and was largely viewed, given the separation of the Princess of Wales, as the authorized version of Diana's story. Morton's conversations with Diana later became the basis for an American television movie, The Biographer.
The pairing of author and subject occurred only after a British tabloid printed a fabricated story, suggesting that Morton was planning on writing a book about the "portly pepperpot" (as the New York Post called Lewinsky). On hearing this, Lewinsky had her lawyers approach Morton, and the book proposal was bought by St. Martin's Press for $5 million. It topped best-seller lists on both sides of the Atlantic, despite dismal reviews taking Morton to task for his purple prose and sentimental approach.
Teresa Budasi of the Chicago Tribune described the book as "fascinating" - though Budasi also brought up a "question as to what’s true and what isn’t." Budasi summed up her impression of the work, writing "Morton’s book is as much an indictment on Cruise’s chosen faith as it is the life story of one of the world’s biggest movie stars. And by the end you realize that “Scientologist” is what will end up being the role of his lifetime." In a review in The Buffalo News, Jeff Simon wrote of the author: "To give Morton the credit he’s clearly due: He is one of the best around at constructing a 250-page gossip column."
Upon its publication, Cruise's lawyer and the Church of Scientology released statements which question the truthfulness assertions made by Morton in the book. In a 15-page statement released to the press, the Church of Scientology called the book "a bigoted, defamatory assault replete with lies." The book was not published in the United Kingdom, Australia, and New Zealand due to strict libel laws in those countries.
Then Morton moved on to "king and queen of pop culture," as he termed them, David Beckham and his wife Victoria. Posh and Becks, became a No. 1 best-seller in the United Kingdom, but received little attention in the United States.
Soon after, Morton announced that he would be taking on the "queen of pop", Madonna. She asked all her friends not to cooperate, but Morton assured the press that he would get them to talk anyway. Despite a seven figure advance by St. Martin's Press and a 500,000-copy first printing, Madonna failed to make waves in America, where it spent only two weeks on the New York Times best-seller list (peaking at No. 8). By contrast, J. Randy Taraborrelli's Madonna: An Intimate Biography, released at the same time, became a massive best-seller. Morton subsequently wrote another Diana book entitled In Pursuit of Love, with information that he had left unaddressed. The book made the New York Times best-seller list.