Richard Feynman

Matthew Broderick

Arline Greenbaum

Patricia Arquette

Mel Feynman

Peter Riegert

Young Richard

Jeffrey Force

Tutti Feynman

Dori Brenner

Harold

David Drew Gallagher

Dr. Gell-Mann

Peter Michael Goetz

Robert

Raffi Di Blasio

Bill Price

Zeljko Ivanek

John Wheeler

James Legros

David

Josh Keaton

Aunt Ruth

Joyce Van Patten

Abacus Adder

James Hong

Young Joan

Melissa DeLizia

Nurse Kate

Kelly Wolf

David

Joshua Wiener

Country Doctor No. 2

Mary Pat Gleason

Kid

Emerson Tran

Country Doctor No. 1

John Hammil

Calculator Kid No. 3

Joshua Malina

Gate Guard

Matt Mulhern

Mr. Greenbaum

Jack Lindine

Country Nurse No. 1

Helene Moore

Neighborhood Doctor

Horton Foote Jr.

Aunt Rose

Mary Kay Wulf

Family Doctor

Laurence Haddon

Driver

Tom Kurlander

Passenger No. 1

Mark Burnham

Passenger No. 2

Googy Gress

Passenger No. 3

Joshua Goldin

Gil

Erich Anderson

Calculator Kid No. 1

Drew Ebersole

Stan Ivanek

John Patterson

Calculator Kid No. 2

Damion Scheller

Calculator Kid No. 4

Demetrius Navarro

Garo

Cosimo Sherman

Rob

Geoffrey Nauffts

Chepa

David Barrera

Strong Fellow

Patrick James Clark

Mechanic

Kirk Fox

Nurse Gracie

Marianne Muellerleile

Sewing Girl on Train

Michelle Feynman

Joan Feynman

Kristin Dattilo Hayward

Isadore Rabi

Bill Bolender

Henry

Corbitt Smith