Robert K. Greenleaf — American Businessman died on December 30, 1990

Robert K. Greenleaf was the founder of the modern Servant leadership movement and the Greenleaf Center for Servant Leadership... (wikipedia)

Good leaders must first become good servants.
Even the frankest and bravest of subordinates do not talk with their boss the same way they talk with colleagues.
Many attempts to communicate are nullified by saying too much.