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Paul Edward Valentine Giamatti ( JEE-ə-MAH-tee; born June 6, 1967) is an American actor. Giamatti began his career as a character actor before establishing himself in leading roles in film and television. He has received numerous accolades including two Emmy Awards and two Golden Globe Awards, along with a nomination for an Academy Award.
After studying acting at the Yale School of Drama he performed in numerous theatrical productions. Giamatti made his Broadway debut portraying Ezra Chater in the Tom Stoppard play Arcadia (1995). Later that year he played The Rev. Donald "Streaky" Bacon in the David Hare play Racing Demon (1995). He returned to theatre in the revivals of Anton Chekov's Three Sisters (1997) and Eugene O'Neill's The Iceman Cometh (1999).
Giamatti's breakout role in film was in Private Parts (1997) which led to supporting roles in My Best Friend's Wedding (1997), Saving Private Ryan (1998), and Man on the Moon (1999). He won acclaim for his leading roles American Splendor (2003), Sideways (2004), Win Win (2011), Private Life (2018), and The Holdovers (2023). He earned a nomination for the Academy Award for Best Supporting Actor for his role as Joe Gould in Cinderella Man (2005). During this time he also acted in The Illusionist (2006), Fred Claus (2007), The Ides of March (2011), 12 Years a Slave (2013), and Saving Mr. Banks (2013). He also portrayed Eugene Landy in Love & Mercy (2014) and Jerry Heller in Straight Outta Compton (2015).
He played the titular character in the HBO miniseries John Adams (2008), which earned him acclaim and several awards including the Primetime Emmy Award a Golden Globe Award, and Screen Actors Guild Award. He starred as U.S. Attorney Chuck Rhoades Jr in the Showtime television series Billions (2016–2023) earning a Critics' Choice Television Award nomination. He earned Primetime Emmy Award nominations for his roles as Ben Bernanke in the HBO film Too Big to Fail (2011), and Harold Levinson in the PBS series Downton Abbey (2013).