During that period one character, Herbert Hoover, played a major role and defined what it meant to be a public servant. The irony is that his failed one term Presidency, and the man himself, may have had a more lasting influence than Presidents who served much longer and appeared to be much more successful.
This real story of Herbert Hoover is told by Kenneth Whyte in Hoover: An Extraordinary Life in Extraordinary Times.
My conversation with Kenneth Whyte: