Simon Oliver Sinek is an English-born American author and motivational speaker well-known for his insights on business leadership. Educated at Brandeis University, Sinek has penned several notable works including Start With Why (2009) and The Infinite Game (2019). He has become famous for his concept of "The Golden Circle."

Sinek is described as an optimist who believes in a bright future that we can build together. Known as "a visionary thinker with a rare intellect," he teaches leaders and organizations how to inspire people. Sinek's aim is to help create a world where the vast majority of individuals feel fulfilled by their work. He leads a movement to motivate individuals to engage in work that inspires them. His unconventional and innovative views on business and leadership have garnered international attention, leading to meetings with leaders and organizations around the world, including Microsoft, MARS, SAP, Intel, 3M, the United States Military, and members of the United States Congress.