John Maxwell is best known for his work on leadership. His most well-known book is call the 21 Irrefutable Laws of Leadership. He prides himself of being a person of discipline and even said he wants to be remembered as a person who did what he had to do, day in, day out. He is a passionate pastor who has sold more than 13 million books with several of his titles being on the New York Times Best Seller List.
You can visit his website at www.johnmaxwell.com. Here's a video of him speaking about the secrets of success.