Jack Dorsey

Jack Dorsey is an American businessman best known as the founder of the social networking site Twitter. Jack Dorsey became involved in web development as a college student, founding the Twitter social networking site in 2006. Since that time, Dorsey has served as CEO, chairman of the board, and executive chairman of Twitter. He also launched the successful online payment platform Block Inc. in 2010 (previously known as Square), where he is CEO.