Mark Zuckerberg is the co-founder and CEO of Facebook. He showed an early interest in computers and created programs like 'ZuckNet' in high school. He attended Harvard where he created Facebook in 2004 from his dorm room, initially limiting membership to Harvard students. Facebook later expanded and went public in 2012, making Zuckerberg a billionaire at age 23. Under his leadership, Facebook has grown tremendously through innovations, acquisitions, and a focus on mobile users.