# Jack Dorsey ![[50 Resources/51 Attachments/51.03 Public/2026-03-18 Jack Dorsey.jpg|400]] Jack Patrick Dorsey (born November 19, 1976, St. Louis, Missouri) is a technology entrepreneur best known as co-founder of Twitter and founder of Square (now Block, Inc.). ## Career **Early years:** As a teenager, Dorsey became fascinated with dispatch routing software — how taxis, couriers, and emergency services moved through cities. He studied at Missouri University of Science and Technology, then transferred to NYU, but dropped out. In 2000 he launched a web-based real-time dispatch platform in Oakland, CA. **Twitter (2006–2021):** Dorsey co-founded Twitter in 2006 alongside Biz Stone, Noah Glass, and Ev Williams. He sent the very first tweet on March 21, 2006. He served as CEO until 2008, when Ev Williams took over. He returned as interim CEO in 2015 and was confirmed as permanent CEO shortly after. He resigned in November 2021, handing leadership to Parag Agrawal. **Square / Block (2009–present):** While still at Twitter, Dorsey co-founded Square with Jim McKelvey in 2009 to make card payments accessible to small businesses via a simple dongle. Square went public in 2015. In 2021 the company rebranded as **Block, Inc.** to reflect its broader focus on Bitcoin and financial services (Cash App, Spiral, TBD). Dorsey serves as CEO. **Bluesky & AT Protocol:** Dorsey championed the creation of Bluesky, a decentralized social network built on the AT Protocol, as a long-term alternative to centralized platforms. ## Known For - Radical minimalism: meditates daily, practices intermittent fasting, walks ~5 miles to work - Strong advocate for Bitcoin (openly dismissive of other crypto) - Philosophy of building tools that empower individuals financially and communicatively ## Quotes <!-- QueryToSerialize: LIST FROM #type/quote AND [[Jack Dorsey]] WHERE public_note = true SORT file.name ASC --> <!-- SerializedQuery: LIST FROM #type/quote AND [[Jack Dorsey]] WHERE public_note = true SORT file.name ASC --> - [[Limit the number of details and make every detail perfect]] <!-- SerializedQuery END --> ## Books <!-- QueryToSerialize: LIST FROM #type/book AND [[Jack Dorsey]] WHERE public_note = true SORT file.name ASC --> ## Related - ## References - https://en.wikipedia.org/wiki/Jack_Dorsey