Warren Bennis — American Writer born on March 08, 1925,

Warren Gamaliel Bennis was an American scholar, organizational consultant and author, widely regarded as a pioneer of the contemporary field of Leadership studies. Bennis was University Professor and Distinguished Professor of Business Administration and Founding Chairman of The Leadership Institute at the University of Southern California... (wikipedia)

Excellence is a better teacher than mediocrity. The lessons of the ordinary are everywhere. Truly profound and original insights are to be found only in studying the exemplary.
The manager accepts the status quo; the leader challenges it.
Find the appropriate balance of competing claims by various groups of stakeholders. All claims deserve consideration but some claims are more important than others.
Leadership is the capacity to translate vision into reality.
Success in management requires learning as fast as the world is changing.