Jason Robards
Narrator (voice)
Acting
Red Barber
Self - Radio Announcer
Acting
Erik Barnouw
Self - Historian
Writing
Ken Bilby
Self - Biographer of David Sarnoff
Acting
Norman Corwin
Self - Writer
Writing
Susan Douglas
Self - Historian
Acting
Frank Günther
Self - Engineer
Acting
Jeanne Hammond
Self - Niece of Edwin H. Armstrong
Acting
Loren Jones
Self - Engineer
Acting
Garrison Keillor
Self - Writer
Acting
Helen Kelley
Self - Radio Broadcaster
Acting
Robert Morris
Self - Engineer
Acting
Dana Raymond
Self - Friend of Edwin H. Armstrong
Acting
Gertrude Tyne
Self - Engineer
Acting
Fred Allen
Self - Predicts Demise of Radio (archive footage)
Acting
Gene Autry
Self - Sings (archive sound)
Acting
John Barrymore
Hamlet (archive sound)
Acting
Winston Churchill
Self - Finest Hour Speech (archive sound)
Acting
Charles J. Correll
Self - Prepares for Amos 'n' Andy Broadcast (archive footage)
Acting
Lee De Forest
Self - Objects to Quality of Radio Programming (archive footage)
Directing
Ralph Edwards
Self - Host of 'This Is Your Life' (archive footage)
Acting
Dwight D. Eisenhower
Self - Announces Landing in Normandy (archive footage)
Acting
Eugenia Farrar
Self (with Lee De Forest) (archive footage)
Acting
Freeman F. Gosden
Self - Prepares for Amos 'n' Andy Broadcast (archive footage)
Acting
Guglielmo Marconi
Self - Visits Sarnoff at RCA (archive footage)
Acting
Marie Mosquini
Self - with Lee De Forest (archive footage)
Acting
Nelson Rockefeller
Self - Eulogizes Sarnoff (archive footage)
Acting
Franklin D. Roosevelt
Self - Makes Broadcast About Banking Reform (archive footage)
Acting
David Sarnoff
Self - with Marconi at RCA (archive footage)
Acting
Frank Sinatra
Self - Serenades Sarnoff (archive footage)
Acting
Arturo Toscanini
Self - Conducts NBC Symphony (archive footage)
Acting
Harry S. Truman
Self - Announces Bombing of Hiroshima (archive sound)
Acting
Bob Warren
Self - This is Your Life Announcer (archive footage)
Acting
Orson Welles
Self - Professor in War of the Worlds Broadcast (archive sound)
Directing