Simon Sinek

Simon Sinek is a British-American author, motivational speaker, and marketing consultant. He is best known for his TED Talk on the "Golden Circle," which explains why some individuals and organizations can inspire while others are not. 

Sinek's TED Talk is one of the most-viewed TED Talks of all time, and he has since written several books, including "Start With Why: How Great Leaders Inspire Everyone to Take Action." 

In "Start With Why: How Great Leaders Inspire Action," Sinek explains that successful companies and leaders start by clearly communicating their "why" - their purpose or belief - and then work backward to define their "how" and "what." He argues that this approach inspires others to believe in and support their vision. The talk has been viewed over 60 million times and is among the most popular TED Talks.

Sinek has also worked with various organizations and companies to help them better understand and communicate their purpose. He is a frequent speaker at conferences and other events, and business leaders and entrepreneurs have widely adopted his ideas.