Hi s hillyar
I have to say, everytime you repost the question, it sends me on such a chase. I was so surprised how difficult it was to find some contact information for a man that is still working. While he is not writing for magazines any more, he is writing books and HBO just turned one of his books into a movie.
Since I could find nothing on how to contact Dan. I thought you would probably be able to more easily get correspondence to his daughter Sally, who is working for the Washington Post. I would assume that she would be willing to pass on information to her father (I would).
I know this isn't exactly what you are looking for but I hope it helps. Or maybe she can give you a contact email or address for him.
Sally Jenkin's "Email Me" webpage at the Washington Post is: