In Chapter 23 of 23 in his 2013 Capture Your Flag interview, author and public speaker Simon Sinek answers "What is on Your Mind As You Turn 40 This Year?" Sinek shares that going into his 40th year he does not feel his age. Living with youthful exuberance, Sinek embraces a life of curiosity and wonder. He wonders if and how his fortieth birthday will change his approach to life. Simon Sinek teaches leaders and organizations how to inspire people. Sinek is the author of two books, "Leaders Eat Last: Why Some Teams Come Together and Others Don't" and "Start With Why: How Great Leaders Inspire Everyone to Take Action". He is a public speaker, an adjunct professor at Columbia University and a Brandeis University graduate.