In Chapter 5 of 20 in his 2011 Capture Your Flag interview with host Erik Michielsen, author and leadership expert Simon Sinek shares why momentum, not results, is how he measures success. He notes how success is something everyone pursues but few can measure and define. Sinek is less concerned with financial or lifestyle markers as success measurements and more about momentum, and seeing things start and begin to roll by themselves. He compares this to a rolling stone that gathers no moss and layers his purpose to keep that initiative moving. Simon Sinek is a trained ethnographer who applies his curiosity around why people do what they do to teach leaders and companies how to inspire people. He is the author of "Start With Why: How Great Leaders Inspire Everyone to Take Action". Sinek holds a BA degree in cultural anthropology from Brandeis University.