Jason Robards

Narrator (voice)

Red Barber

Self - Radio Announcer

Erik Barnouw

Self - Historian

Ken Bilby

Self - Biographer of David Sarnoff

Norman Corwin

Self - Writer

Susan Douglas

Self - Historian

Frank Günther

Self - Engineer

Jeanne Hammond

Self - Niece of Edwin H. Armstrong

Loren Jones

Self - Engineer

Garrison Keillor

Self - Writer

Helen Kelley

Self - Radio Broadcaster

Robert Morris

Self - Engineer

Dana Raymond

Self - Friend of Edwin H. Armstrong

Gertrude Tyne

Self - Engineer

Fred Allen

Self - Predicts Demise of Radio (archive footage)

Ken Burns