On Friday, May 4th at 10pm ET/PT, CNBC presents "Warren Buffett: Investor. Teacher. Icon." a one-hour documentary reported by CNBC's Becky Quick that examines Buffett's role as a teacher who has profoundly affected people, both by his own example and through his life lessons. The program premieres the night before the Annual Shareholders Meeting of Berkshire Hathaway, the company that Buffett has led for more than 50 years and turned into a behemoth now worth almost half a trillion dollars.