Simon O. Sinek is an author, speaker, and consultant who writes about leadership and management. He is known for popularizing concepts such as the Golden Circle and the 5 Why widely adopted by professionals around the world. Sinek began his career in the New York advertising agencies Euro RSCG and Ogilvy & Mather. He later launched his own business, Sinek Partners. His lecture How Great Leaders Inspire Action is listed as the third most popular TED presentation of all time. In October 2009, he published his book, Start with Why: How Great Leaders Inspire Action. Sinek taught in strategic communications postgraduate studies at Columbia University and consulted for Disney, Microsoft, Pfizer and the US military.
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