Simon Sinek has a simple but powerful model for inspirational leadership all starting with a golden circle and the question "Why?" His examples include Apple, Martin Luther King, and the Wright brothers ... (Filmed at TEDxPugetSound.)

In 2009, Simon Sinek released the book "Start With Why" -- a synopsis of the theory he has begun using to teach others how to become effective leaders and inspire change. Full bio ?

"If you hire people just because they can do a job, they’ll work for your money. But if you hire people who believe what you believe, they’ll work for you with blood and sweat and tears.” (Simon Sinek)"

http://www.ted.com/talks/simon_sinek_how_great_leaders_inspire_action.html