Simon Oliver Sinek (born October 9, 1973) is a British-American author and inspirational speaker focused on leadership and organizational culture. He is known for popularizing the concept of the "Golden Circle" and for his TED Talk "How Great Leaders Inspire Action," which has garnered over 60 million views. Sinek's central idea revolves around "Start With Why," urging leaders and organizations to define their core purpose. He is described as an "unshakeable optimist" with a vision to inspire people to feel safe and fulfilled in their work.
Sinek is the author of bestselling books including "Start With Why," "Leaders Eat Last," "Together is Better," "Find Your Why," and "The Infinite Game". He is the founder of The Optimism Company, a leadership learning and development company, and Optimism Press, a publishing partnership with Penguin Random House. He is also an adjunct staff member at the RAND Corporation. Sinek's work extends to advising various organizations, from the US Armed Forces to corporations like Microsoft and Disney. In 2021, he founded The Curve, a group dedicated to police reform.