Jack Dorsey days, Dorsey worked occasionally as a fashion model. By age fourteen, Dorsey had become interested in dispatch routing. Some of the open-source software he created in the area of dispatch logistics is still used by many taxi cab companies. Dorsey attended the University of Missouri–Rolla for two-plus years (1995–1997) before transferring to New York University, but he dropped out in 1999, one semester short of graduating. He first came up with the idea that he developed as Twitter while studying at New York University. While working on dispatching as a programmer, Dorsey moved to California. In 2000, Dorsey started his
J. Michael Dorsey committee for public money for housing, alongside Thomas Demery and Carl Covitz. The committee was the subject of controversy when a federal audit released in 1989 said that most of the money approved by it went to developers with HUD connections. It said that Dorsey and Covitz typically agreed to suggestions that Demery made. He briefly served as Acting Secretary of HUD in 1989, before Jack Kemp became Secretary. On July 13, 1989, Frank Keating was confirmed as General Counsel, succeeding Dorsey. On July 13, 1990, Joseph G. Schiff was confirmed as Assistant Secretary in place of Dorsey. Dorsey became