Jack Dorsey is an American businessman who co-founded Twitter. Twitter, an online social networking service that enables users to send and read short messages called ‘tweets,’ is one of the ten most-visited websites in the world. Dorsey is also the founder of ‘Square,’ a mobile payments company that markets several software and hardware payments products. A computer programmer by profession, he became interested in dispatch routing while still in his teens. He loved computers from as long as he can remember and spent hours studying the IBM computer model available at that time. He was fascinated with the concept of coordinating taxicabs, couriers, emergency services, and other fleets of vehicles and wanted to create a live map of his city, displaying the vehicles in motion as small moving red dots. He was just 15 when he wrote a program for dispatching taxis and firefighting services. He went on to study at the ‘Missouri University of Science and Technology’ before shifting to the ‘New York University’ where he first came up with the idea for Twitter. He dropped out before receiving his degree to follow his passion. Teaming up with his friends, he launched Twitter in 2006.