Denis Waitley is an expert in sports psychology. His best selling programs include The Psychology of Winning and The Psychology of Success. He has worked with NASA as well as served as the Chairman of Psychology on the U.S. Olympic Sports Medicine Council. He has been a keynote speaker for over 30 years.
I have met and talked with him in person a couple of times and found him to be very genuine. His style of speaking is more mellow but his depth of knowledge in human psychology and success is amazing. His Psychology of Winning audio program is among one of my favorites. You can visit his site at www.denniswaitley.com.
Here is a video of him speaking. The audio isn't the greatest so you may have to turn up your speakers.