He authored/co-authored almost 170 books, which have sold 17 million copies. He wrote biographies on Greta Garbo, Judy Garland, and Rudolph Valentino, the latter of which was adapted as a film in 1977.
He wrote approximately 170 books, which have sold over 17 million copies. He penned biographies on Greta Garbo, Judy Garland, and Rudolph Valentino, with the latter being adapted into a film in 1977.