where the writers are

Agents

P.O. Box 720301
San Francisco CA 94172

Publishers

W.W. Norton, Alfred A. Knopf and (in the U.K.) Weidenfeld & Nicolson and Phoenix (both Orion Books)

Knopf contact information at http://knopfdoubleday.com/contact-us/
Norton contact information at http://www.wwnorton.com/area4/contact.htm