Marcus Giamatti
Biographical Information
Born October 3, 1961
Birthplace New Haven, CT
Gender Male
Years Active 1986-Present
Role Jeffrey Keener
Season Season 6
Episode Known Unknowns
Marcus Giamatti is an American actor.  On House, M.D., he portrayed comic book author Jeffrey Keener in the Season 6 episode Known Unknowns.

Giamatti has had featured roles in Another World, Flying Blind, Hamlet, The Business of Strangers, Judging Amy, Tell Me You Love Me, Look and The Young and the Restless.

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