Programmer and businessman who co-founded Facebook, a social networking website, at age 20 and took it public in 2012.
He was a member of his high school fencing team and attended Harvard University.
He became the world's youngest billionaire after founding a social media site in 2004. In 2015 he was worth over $30 billion.
He was portrayed by Jesse Eisenberg in The Social Network, a film about the conception of Facebook.