someone who thinks carefully (and shares his thoughts) about items of public importance
Richard Posner: Public Intellectuals: A Study of Decline ISBN:067400633X
Alan Lightman http://web.mit.edu/comm-forum/papers/lightman.html
Cary Wolfe on "Getting the Dirt on The Public Intellectual:A Response to Michael Berube"
bio of George Hartmann by BenjaminHarris
Patrick Finn on "Remediating Democracy: The Public Intellectual, HyperText and The West Wing"