Catherine "Kitty" Kelley is an acclaimed American journalist and author, renowned for her investigative and often controversial unauthorized biographies. She has penned detailed accounts of prominent figures, including Jacqueline Kennedy Onassis, Elizabeth Taylor, Frank Sinatra, and the British Royal Family. Her books are known for their extensive research, often involving hundreds of interviews, which has led to both commercial success and significant public debate. Despite facing criticism and legal challenges, Kelley's work has consistently topped bestseller lists, solidifying her reputation as a formidable figure in biographical writing.