Christopher Warwick is an acknowledged authority on British royal history. The authorized biographer of Princess Margaret, sister of Queen Elizabeth II, he is a respected writer, broadcaster, and speaker, who regularly takes part in television and radio programs, as well as television documentaries. A frequent commentator on royal events, including the wedding of William and Catherine, Duke and Duchess of Cambridge, the Queen's Golden- and Diamond Jubilees and the celebrations of the ninetieth birthday of Her Majesty the Queen, for CTV (Canadian Television News Network), Christopher has also acted as guest speaker for, among others, Cunard, Historic Royal Palaces, the Windsor Festival, and Alison Weir Tours. He is the author of a number of bestselling books, among them the acclaimed biography Ella: Princess, Saint and Martyr, which was subsequently released in eBook format as The Life and Death of Ella, Grand Duchess of Russia; Her Majesty, a lavish, large-format celebration of the life and reign of Elizabeth II; Princess Margaret: A Life of Contrasts; and George and Marina, Duke and Duchess of Kent, a revised edition of which was released as an eBook in 2016.