John Michael Crichton , MD (October 23, 1942 – November 4, 2008) was an American best-selling author, physician, producer, director and screenwriter, best known for his work in the science fiction, medical fiction and thriller genres. His books have sold over 200 million copies worldwide, and many have been adapted into films. In 1994, Crichton became the only creative artist ever to have works simultaneously charting at No. 1 in US television (ER), film (Jurassic Park), and book sales (Disclosure).