Wikimedia
Wikipedia: Lee De Forest
This Wikipedia encyclopedia article on Lee de Forest discusses his life and his invention of the triode (or audion), which laid the foundation for radio.
PBS
People and Discoveries: Lee De Forest
A biography on audion inventor, Lee de Forest, from childhood on. Hyperlinks to additional information about the radio and broadcasting.
Massachusetts Institute of Technology
Mit: Invention of the Week: Lee De Forest
This website provides information on the life and inventions of Lee DeForest, the man who invented the audion tube, which made commercial radio broadcasting practical.