Adam D'Angelo is an American internet entrepreneur. He is best known as the co-founder and CEO of Quora, based in Mountain View, California. He was chief technology officer of Facebook, and also served as its vice president of engineering, until 2008. In June 2009, he started Quora. He invested $20 million of his own money into Quora as part of their Series B round of financing. He is a member of the board of directors of OpenAI, and an investor in internet companies.