Simon Sinek is an author best known for popularizing the concept of "the golden circle" and to "Start With Why", described by TED as "a simple but powerful model for inspirational leadership all starting with a golden circle and the question "Why?".
He began his career at Euro/RSCG, an ad agency no known as Havas Worldwide, where he worked on accounts for Oppenheimer Funds, MCI, NASDAQ and DISH Network. In 2002, he started his own company, Sinek Partners.
As of January 2015, his talk "How Great Leaders Inspire Action" was number three on the list of the twenty most popular TED talks of all time. In October 2009, he released his book “Start with Why: How Great Leaders Inspire Everyone to Take Action”, and in December 2011, the book topped the list of best sellers for corporate America. He lives in New York and teaches a graduate-level class in strategic communication at Columbia University