I was about to make this thread. Sad day indeed. Didn't play but one game but I loved his books. He is my favorite author and John Clark is my favorite character of any type of entertainment. The last book is coming out this December. RIP, Tom Clancy, you'll be missed.
Loved his work, especially on the subject of modern submarine warfare like "Submarine" and "Hunt for Red October", the book being better than the movie of course.
I actually used to play "Red Storm Rising" on my Commodore 64, It's basically a sub simulation with a storyline. It's also one of the first books I've read by Tom Clancy.