Richard Feynman

Matthew Broderick

Acting

Arline Greenbaum

Patricia Arquette

Acting

Mel Feynman

Peter Riegert

Acting

Young Richard

Jeffrey Force

Acting

Harold

David Drew Gallagher

Acting

Robert

Raffi Di Blasio

Acting

David

Josh Keaton

Acting

Abacus Adder

James Hong

Acting

Young Joan

Melissa DeLizia

Production

Dr. Gell-Mann

Peter Michael Goetz

Acting

Nurse Kate

Kelly Wolf

Acting

County Nurse #2

Mary Pat Gleason

Acting

Aunt Ruth

Joyce Van Patten

Acting

John Wheeler

James LeGros

Acting

Bill Price

Zeljko Ivanek

Acting

Calculator Kid #3

Joshua Malina

Acting

Gate Guard

Matt Mulhern

Acting