Twitter / Twitter
Software engineer Jack Dorsey is the Co-Founder of Twitter, and was the CEO until October 2008. Dorsey had the original idea for Twitter while still at Odeo, a podcasting startup which was a project of Obvious Corp. He is now the chairman of Twitter.
In May 2009, Dorsey announced his latest startup, Square. Square, originally code-named Squirrel, is a mobile payment startup with both an app and a piece of hardware that allows the iPhone to accept credit card payments.
Dorsey was a student at University of Missouri - Rolla, later New York University, which he dropped out of and left his job as a programmer at a bike courier dispatch service in 1999 to move to San Francisco.
| Company | Date | Round | Size | Participants |
| 7/10 | Series A | $10.5M | 9 | |
| Foursquare | 9/09 | Angel | $1.35M | 9 |
