Jack Patrick Dorsey (born November 19, 1976) is an American Internet entrepreneur, philanthropist, and programmer who is a co-founder and former CEO of Twitter, Inc., as well as co-founder, principal executive officer and chairperson of Block, Inc., the developer of the Square financial services platform. He is also a co-founder of Bluesky, PBLLC, where he currently sits on the board of directors, with Jay Graber serving as CEO. Dorsey was born and raised in St. Louis, Missouri. His father is Tim Dorsey and his mother is Marcia (née Smith) Dorsey. Jack Dorsey is partly of Italian descent on his mother's side. His father worked for a company that developed mass spectrometers and his mother was a homemaker. He was raised Catholic, and his uncle is a Catholic priest in Cincinnati. (Source: Wikipedia.org, CC BY-SA)