There is a great interview on leadership with Jim March (probably the most prestigious living organizational theorist) by Joel Podolny (current head of HR at Apple, but also a very accomplished academic researcher) in the current edition of the Academy of Management Learning and Eduction journal (Vol. 10, No. 3, 502-506.) The link is here, but someone will likely make you buy it.
March, as always, looks at things differently than the rest of us. For example, he does a lovely job of arguing — using historical figures like Aristotle and Alexander the Great — that the time frames used in most leadership research are often too short to be useful. But what really caught my eye was a line that reminded me of that old Pink Floyd song :