Below are three contact addresses for George Clooney. My primary
source for this information was IMDb Pro (a subscription service
affiliated with the Internet Movie Database). Verification was
obtained at ClooneyStudio.com (George Clooney does not have an
official website, but Clooney Studio is one of the most extensive,
accurate, and well-maintained sites which provides info about him).
Smoke House is a new production company co-founded in August 2006 by
George Clooney and Grant Heslov, in agreement with Warner Brothers
(his earlier production company, Section Eight, is being dismantled).
c/o Warner Bros.
4000 Warner Blvd., Bldg. 15
Burbank, CA 91522
George Clooney's agent at CAA is Bryan Lourd.
Creative Artists Agency
9830 Wilshire Blvd.
Beverly Hills, CA 90212
George Clooney's publicist is Stan Rosenfield, of Stan Rosenfield & Associates.
Stan Rosenfield & Associates Ltd.
2029 Century Park East
Los Angeles, CA 90067
These pages from the Clooney Studio site may be of interest to you:
Clooney Studio: Contact
Clooney Studio: Smoke House
I hope this is helpful!