Warren Edward Buffett is an American business magnate, investor, speaker and philanthropist who serves as the chairman and CEO of Berkshire Hathaway. He is considered one of the most successful investors in the world and has a net worth of US$84.4 billion as of November 1, 2018, making him the third-wealthiest person in the world.Buffett was born in Omaha, Nebraska. He developed an interest in business and investing in his youth, eventually entering the Wharton School of the University of Pennsylvania in 1947 before transferring and graduating from University of Nebraska at the age of 19. He went on to graduate from Columbia Business School, where he molded his investment philosophy around the concept of value investing that was pioneered by Benjamin Graham. He attended New York Institute of Finance to focus his economics background and soon after began various business partnerships, including one with Graham.