Steven Spielberg (who turns 73 today!) is more than just one of the most successful and well-respected directors in Hollywood—he’s also a prolific adapter of books and other literary works for the silver screen. Some of his best known works, from Jaws (1974) to the Color Purple (1982) to Jurassic Park (1990), were originally based on books of various levels of literary acclaim. Because one of the great all-time literary and filmic pastimes is comparing novels to their screen adaptations, the book lovers of the world owe Spielberg a huge debt of gratitude (the fact that many of these films are truly great on their own doesn’t hurt either).