Simon Sinek is a speaker known for his "Golden Circle" theory that people are inspired by ideals and beliefs rather than products or plans. His TED talk explaining this theory through examples like Apple, Martin Luther King Jr., and the Wright Brothers is one of the most viewed on TED.com. The document discusses Sinek's career and public speaking style, noting he keeps things simple, uses relatable examples, and connects emotionally without relying on notes, making his presentations engaging.