My literary agent is
Darhansoff & Verrill
133 West 72nd St. #304
New York, NY 10023
Note that Darhansoff & Verrill also handles speaking requests. I almost never accept these. When I do, I charge a lot of money, I demand expensive travel arrangements, and I perform no prep work--I just show up and wing it. Sometimes I make special exceptions to those rules, but when I do, I always end up regretting it. See "Why I Am a Bad Correspondent" and "Why I Am a Sociomediapath" for background.
My agent for film, television, etc. is
10250 Constellation Boulevard
Los Angeles, CA 90067
My publicist for media requests is
New York, NY 10007
Do not under any circumstances try to send me physical objects (letters, bookplates, books--anything whatsoever made of atoms) in the mail. It is unlikely that you are sending them to the right address--the Internet is often wrong--and if they do reach me I will throw them away. See "Why I Am a Bad Correspondent" and "Why I Am a Sociomediapath" for background.