Jack Dorsey (http://twitter.com/jack) is the inventor, Founder and Chairman of Twitter. Originally from St. Louis, Jack's early interest in real-time messaging lead him to Manhattan where he wrote dispatch software for taxis, couriers, and emergency 911 centers.  Throughout his work on dispatch, medical, and ticketing systems, he kept discovering the concept of 'status' updates, which helped fuel the ideas behind Twitter, a global utility connecting people in real-time through short updates from wherever they are.