This address is courtesy of Eunice's DHP Page.......
David Hyde Pierce c/o Frasier Paramount TV 5555 Melrose Avenue Lucille Ball, Rm 101 Hollywood, CA 90038
***It might take some time to get a response if you are requesting an authographed photo of DHP, but that's because he still hand signs his autographs, rather than using an autograph stamp or having someone else sign on his behalf.