Proof

Gwyneth Paltrow

Catherine Llewellyn

Anthony Hopkins

Robert Llewellyn

Jake Gyllenhaal

Harold 'Hal' Dobbs

Hope Davis

Claire Llewellyn

Danny McCarthy

Cop

Tobiasz Daszkiewicz

Limo Driver

Gary Houston

Professor Barrow

Leigh Zimmerman

Friend at Party

Colin Stinton

Theoretical Physicist

Leland Burnett

Band Vocalist

John Keefe

University Friend

Chipo Chung

University Friend

C. Gerod Harris

University Friend

Roshan Seth

Professor Bhandari

Anne Wittman

Friend at Party

Lolly Susi

Airport Check-In Lady