Katherine Kelley (born April 4, 1942) is an American journalist and author of best-selling unauthorized biographies of Jacqueline Kennedy Onassis, Elizabeth Taylor, Frank Sinatra, Nancy Reagan, the British royal family, the Bush family, and Oprah Winfrey. For the Sinatra biography, Kelley won praise for the quality of her research and willingness to risk a lawsuit, but critics have not rated her other works as highly. She has been described as a "professional sensationalist" and the "consummate …