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
Troy (Dorsey, Maryland) which was split into two unequal parts in 1760 and given to Sarah Dorsey and Thomas Dorsey. Thomas Dorsey would use the root cellar as a meeting place with Benjamin Warfield of Cherry Grove during the revolutionary war. Thomas's widow Elizabeth split Troy several times to pay debts. Vincent Bailey acquired including Troy for $6,520. A stone house named "Troy Hill" was built about 1808 on the foundation of an earlier Dorsey house by Vincent Baily and is representative of the late Georgian style in Maryland architecture. The -story fieldstone house is three bays wide and two deep. Outbuildings included