I would like to know how to contact Philip Roth or his agent about a
speaker's series and learn what he charges for one evening. including
travel expenses etc.

Hello dayenu,

Here are links to contact information for Philip Roth via his
publisher and literary agent.

"How do I contact a Houghton Mifflin author?"
Houghton Mifflin
http://www.houghtonmifflinbooks.com/faq/authors.html

The Wylie Agency
http://www.wylieagency.com/

[Note: I presume that you should insert "Author's Name c/o" in a
letter to the Wylie Agency address as is suggested for the Houghton
Mifflin address.]

The following pages confirm that Philip Roth remains associated with
these entities.

"Philip Roth"
Houghton Mifflin
http://www.houghtonmifflinbooks.com/authors/roth/

"Client List"
The Wylie Agency
http://www.wylieagency.com/CLIENT%20LIST.htm

- justaskscott


Search strategy -- 

Searched on Google for various combinations of these terms:

"philip roth"
"his agent"
"roth's agent"
"andrew wylie"
agency
"wylie agency"
"250 * 57th"

Browsed Houghton Mifflin and Wylie Agency sites.

I found Houghton Mifflin myself but didn't see a contact .... I wrote
to the wylie agency and if they respond I wonder if I can rate you
even higher. Thanks for the speed.