Which management scholar/thinker has most influenced your own philosophy of management?
Let's not be too restrictive. For example, if Aristotle or Plato are your pick, that's fine. Close seconds may also be listed.
[I'm pretty sure about my first choice, but will think a little longer.]
Some possible suspects:
W. Edwards Deming
Stephen R. Covey
Mary Parker Follett
Manfred F.R. Kets De Vries
James Q. Wilson
UPDATE: How could I have hesitated? Drucker, of course.