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Christopher Peter Andersen (born May 26, 1949) is an American journalist and the author of 32 books, including many bestsellers. A graduate of the University of California at Berkeley, Andersen joined the staff of Time Magazine as a contributing editor in 1969. From 1974 to 1986 Andersen was senior editor of Time Incorporated's People Magazine. He has also written for a wide range of publications, including The New York Times, The New York Daily News, Life, and Vanity Fair.
While his early nonfiction books veered from psychology (The Name Game) to true crime (The Serpent's Tooth) to art collecting ('The Best of Everything', with former Sotheby's chairman John Marion), he is best known for his controversial biographies. Between 1991 and 2011, he published 14 New York Times bestselling biographies. Andersen wrote Mick: The Wild Life and Mad Genius of Jagger, to coincide with the 50th anniversary of the Rolling Stones in July 2012. The book quickly became Andersen's 15th New York Times bestseller.
Seven of Andersen's titles have also been selected for the Readers Digest Today's Best Nonfiction Books of the Year series. In November 2008, NBC's Brian Williams presented Andersen with a Joan's Legacy Award for excellence in journalism regarding lung cancer, along with Ladies Home Journal, which excerpted the portion of his book Somewhere in Heaven: The Remarkable Love Story of Dana and Christopher Reeve describing Dana Reeve's battle with lung cancer. Madonna Unauthorized (1991) and The Day John Died (2000) were made into television films. 
Andersen has frequently appeared on TV programs such as the Today Show, Entertainment Tonight, Larry King Live, the CBS Early Show, Dateline, Extra, The O'Reilly Factor, NBC Evening News, Inside Edition, and Hardball.
Married since 1972 to former international banker Valerie Hess, Andersen resides in Connecticut. They have two daughters—network TV news producer Katharine (born 1980) and Kelly (born 1990).