Mark Elliot Zuckerberg (/ˈzʌkərbɜːrɡ/; born May 14, 1984) is an American internet entrepreneur and philanthropist. He is known for co-founding Facebook, Inc. and serves as its chairman, chief executive officer, and controlling shareholder. He also co-founded and is a board member of the solar sail spacecraft development project Breakthrough Starshot.
Born in White Plains, New York, Zuckerberg attended Harvard University, where he launched the Facebook social networking service from his dormitory room on February 4, 2004, with college roommates Eduardo Saverin, Andrew McCollum, Dustin Moskovitz, and Chris Hughes. Originally launched to select college campuses, the site expanded rapidly and eventually beyond colleges, reaching one billion users by 2012. Zuckerberg took the company public in May 2012 with majority shares. His net worth is estimated to be nearly $54 billion as of March 2020. In 2007, at age 23, he became the world's youngest self-made billionaire. As of 2019, he is the only person under 50 in the Forbes ten richest people list, and the only one under 40 in the Top 20 Billionaires list.