Simon Sinek is a British-American author, motivational speaker, and organizational consultant best known for popularizing the concept of "the golden circle" through his TED talks. He was born on October 9, 1973, in Wimbledon, London, UK. In his books and speeches, Sinek emphasizes leadership, behavior, and motivation. His first book, "Start With Why: How Great Leaders Inspire Everyone to Take Action," published in 2009, has become a global bestseller and is often regarded as a "must-read" for individuals and businesses. His other notable works include "Leaders Eat Last" and "The Infinite Game." Sinek graduated from Brandeis University with a BA in cultural anthropology.