"Father of Advertising" David Ogilvy on the ten qualities creative leaders must have. His book Confessions of an Advertising Man is a must read.  

1. High standards of personal ethics.
2. Big people, without pettiness.
3. Guts under pressure, resilience in defeat.
4. Brilliant brains — not safe plodders.
5. A capacity for hard work and midnight oil.
6. Charisma — charm and persuasiveness.
7. A streak of unorthodoxy — creative innovators.
8. The courage to make tough decisions.
9. Inspiring enthusiasts — with trust and gusto.
10. A sense of humor.