Mark Elliot Zuckerberg (born May 14, 1984) is an American computer programmer and Internet entrepreneur. He is best known as one of five co-founders of the social networking site Facebook. Zuckerberg is the chairman and chief executive of Facebook, Inc. Zuckerberg’s personal wealth is estimated to be $9.4 billion as of 2012. Born and raised in New York state, Zuckerberg began writing software as a hobby in middle school, with help from his father and a tutor (who called him a prodigy).