1908 Ian Fleming - British author and creator of James Bond. Fleming worked in naval intelligence during the Second World War, and was a journalist for Reuters and the London Times, stationed in Moscow for both. All of his books were filmed, including Chitty Chitty Bang Bang

I have read his complete works. To say that all of his books were filmed is a bit of a stretch. I'll admit all of the titles were used but movies such as A View to a Kill had nothing in common with the book other than the title.