Day One

Gen. Leslie Groves

J. Robert Oppenheimer

Leo Szilard

James F. Byrnes

President Harry S. Truman

Gen. George Marshall

Henry Stimson

Dr. Arthur Compton

Franklin D. Roosevelt

Kitty Oppenheimer

Acting

Colonel Pash

Edward Teller

Acting

Seth

Dwight D. Eisenhower

Groves's Commanding Officer

Acting

Ralph A. Bard

Enrico Fermi

Trude Weiss

Colonel Nichols

Eugen Wigner

Albert Einstein