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
Firm Biz Firm Biz "Firm Biz" is the first single by the Hip hop supergroup The Firm from their singular collaborative LP "The Album". The song was produced by L.E.S, who based the song's track on a sample of Teena Marie's 1981 hit "Square Biz". "Firm Biz" also features a chorus performed by former En Vogue singer Dawn Robinson, reworked from the "Square Biz" chorus. AZ raps the first verse of the song, Nas the second, and Foxy Brown the third and final verse. The song never reached any US chart positions, but was a UK Top 20 hit in 1997. A