Jack Dorsey Bio
Jack Patrick Dorsey, born on November 19, 1976, in St. Louis, Missouri, is an American technology entrepreneur and businessman widely recognized for co-founding Twitter, Inc. and the financial services company Block, Inc., originally known as Square. He served as Chief Executive Officer of Twitter during 2007–2008 and again from 2015 until his resignation in November 2021, while continuing to lead Block as its principal executive. Dorsey has also founded the decentralized social networking project Bluesky and has emerged as a prominent public advocate for Bitcoin and open technology platforms.
According to Forbes, his net worth was estimated at approximately $5.9 billion as of February 2026, reflecting his long-standing role in shaping the social media and digital payments industries. Beyond his business interests, Dorsey is known for his interest in meditation, his support for civic causes, and his vocal endorsement of decentralized internet technologies. He currently resides in San Francisco, California.
Early Life and Background
Jack Patrick Dorsey was raised in St. Louis, Missouri, the son of Timothy G. Dorsey and Marcia A. Dorsey. His father worked for a company that developed mass spectrometers, while his mother was a homemaker. Dorsey is partly of Italian descent on his mother’s side and was raised Catholic. Growing up in a household that valued both technical work and family life, he developed an early curiosity about how communication systems could connect people in new ways.
By the age of 14, Dorsey had become fascinated with the idea of dispatch routing, the process of coordinating taxis, couriers, and emergency services in real time. He attended Bishop DuBourg High School in St. Louis, where he also worked occasionally as a fashion model during his teenage years. His early interest in routing and messaging laid the conceptual foundation for the platforms he would later build.
Dorsey enrolled at the University of Missouri–Rolla, now the Missouri University of Science and Technology, in 1995, attending for more than two years before transferring to New York University in 1997. He later dropped out of New York University one semester short of graduating. During his time in New York, he continued developing ideas around real-time communication and short message systems, the concepts that would later form the basis of Twitter.
Path to Founding Twitter
While working on dispatch software as a programmer, Dorsey moved to California and, in 2000, launched his own company in Oakland to coordinate couriers, taxis, and emergency services through the Web. Around this time he explored other projects, including networks of medical devices and what he called a frictionless service market. In July 2000, inspired in part by LiveJournal and AOL Instant Messenger, Dorsey conceived the idea for a web-based real-time status and short message service.
He later brought the concept to Odeo, a podcasting startup where he met co-founders Biz Stone and Evan Williams. Together, with contributions from Noah Glass, the group built a working prototype of Twitter in about two weeks. The platform attracted strong interest from investors and was spun out from Odeo through Obvious Corporation, with Dorsey, Williams, and Stone among the co-founders of the new company. Dorsey became Twitter’s founding CEO in 2007, guiding the young company through two early rounds of venture funding.
Jack Dorsey Career
Early Career at Twitter (2007–2008)
During his first tenure as CEO, Dorsey emphasized simplicity, constraint, and craftsmanship as guiding principles for the company. He prioritized improving the platform’s uptime over short-term revenue, a decision that helped establish Twitter’s reputation for reliability during a period of rapid user growth. Under his leadership, Twitter secured venture capital and began scaling its infrastructure to support an expanding global audience.
Dorsey was removed from the CEO role in 2008, reportedly for spending too much time on outside interests, including fashion design and yoga. On October 16, 2008, co-founder Evan Williams took over as CEO, and Dorsey became chairman of the board. In that role, he joined several United States State Department delegations, including trips to Iraq in April 2009 and to Russia in February 2010, and played a role in delaying scheduled Twitter maintenance during the 2009 Iranian Green Movement to support protest communications.
Return to Twitter Leadership (2011–2015)
In March 2011, Dorsey returned to Twitter as executive chairman after Dick Costolo replaced Williams as CEO. During this period he continued to shape product direction and strategy while the company expanded its advertising business and user base. By 2015, Twitter was a publicly traded company facing challenges in user growth, and Dorsey re-engaged more directly in day-to-day operations.
Following Costolo’s resignation in July 2015, Dorsey assumed the role of interim CEO and was named permanent CEO in October 2015. That same month, Block, Inc., then still operating as Square, filed for an initial public offering on the New York Stock Exchange, with Dorsey owning roughly 24.4 percent of the company. The dual leadership of two major technology firms placed Dorsey among a small group of executives running both a public social media platform and a public financial services company.
Second Tenure as Twitter CEO (2015–2021)
As CEO, Dorsey pushed several major product changes, including a May 2016 decision to exclude photos and links from the platform’s 140-character limit, a move intended to encourage new user activity. In September 2018, he testified before the United States Senate Intelligence Committee alongside Facebook’s Sheryl Sandberg regarding Russian interference in the 2016 presidential election, a session that was followed by a notable drop in Twitter’s share price.
In November 2019, Dorsey announced a global ban on political advertising on Twitter, citing concerns about the influence of paid political messaging on public discourse. He also navigated investor pressure in early 2020, when activist hedge fund Elliott Management sought to oust him, ultimately reaching an agreement that allowed him to remain CEO. On November 29, 2021, Dorsey announced his immediate resignation from Twitter, and was succeeded by Chief Technology Officer Parag Agrawal. Dorsey retained his 2.4 percent ownership stake in the company when it was sold to Elon Musk in October 2022, and departed Twitter’s board in May 2022.
Block, Inc. and Square Era (2010–Present)
In 2010, Dorsey and co-founder Jim McKelvey launched Square, a mobile payments platform that allowed small businesses to accept debit and credit card payments through a small card reader attached to a smartphone or tablet. The product quickly gained adoption, with the company growing from ten employees in December 2009 to over one hundred by June 2011. Square went public on the New York Stock Exchange on October 14, 2015, and received Federal Deposit Insurance Corporation approval in March 2020 to launch Square Financial Services, a banking arm that began operations in 2021.
In May 2020, Dorsey announced that Square employees would permanently become remote workers, a notable workforce policy in the technology sector. On December 1, 2021, he officially rebranded the parent company as Block, Inc., reflecting its expansion beyond merchant payments into areas such as Cash App, Tidal, and bitcoin-related services. The stock ticker remained SQ. Dorsey continues to lead Block as chief executive officer and chairman, overseeing its payments, financial services, and digital currency initiatives.
Notable Events and Milestones
Among Dorsey’s signature achievements are co-founding two of the most influential technology companies of the twenty-first century, Twitter and Square, and leading both as public-company chief executive officers. He played a direct role in shaping policy decisions with geopolitical consequences, including the 2009 decision to delay Twitter maintenance during the Iranian Green Movement, and the 2019 ban on political advertising. His resignation from Twitter in 2021 marked the end of an era for the company he had helped create, while his continued leadership of Block, Inc. reflects his enduring influence on the digital payments industry.
Jack Dorsey Career Wins
Over the course of his career, Jack Dorsey has built and led multiple billion-dollar technology companies, helped shape the modern social media landscape, and influenced public policy discussions on content moderation, political advertising, and digital currencies. His work has been recognized through invitations to testify before the United States Senate, leadership of major initial public offerings, and a personal fortune estimated at $5.9 billion by Forbes as of February 2026.
Career Highlights
Dorsey’s first major career milestone was the founding of Twitter in 2006 and his appointment as the company’s first CEO in 2007, a role that established him as a leading voice in the emerging social media industry. His second major milestone came in 2010 with the launch of Square, which grew from a small Oakland startup into a publicly traded financial services company with a valuation in the billions of dollars by the early 2020s.
More recently, Dorsey’s most notable accomplishment has been the continued leadership of Block, Inc. following the December 2021 corporate rebranding, and his active advocacy for Bitcoin and decentralized technologies. In 2025, he launched Bitchat, a peer-to-peer messaging app that uses Bluetooth mesh networking to connect nearby users without an internet connection, and in November 2025 announced his support for a new app called diVine, based on the defunct Vine platform.
Other Wins and Achievements
Dorsey has also contributed to civic and philanthropic efforts, including a $15 million donation in 2020 to 29 United States mayors piloting guaranteed basic income programs, a $350,000 contribution to the #TeamTrees campaign in October 2019, and a $10 million donation in August 2020 to Boston University’s Center for Antiracist Research. In April 2020, he pledged approximately $1 billion of his equity in Square, Inc. to Start Small, LLC, supporting COVID-19 relief, girls’ education, and universal basic income initiatives.
Jack Dorsey Family
Family Background and Personal Lineage
Jack Patrick Dorsey was born to Timothy G. Dorsey and Marcia A. Dorsey, and raised in St. Louis, Missouri, alongside siblings whose details have remained largely private. His father worked in the field of mass spectrometry, while his mother was a homemaker, and the family is partly of Italian descent on his mother’s side. Dorsey has said that his early family environment and Catholic upbringing helped shape his values around discipline, simplicity, and focus, qualities he has often cited as guiding principles in his professional life.
Personal Life
Dorsey has generally kept his personal life out of the public eye and no details about a spouse, partner, or children are publicly confirmed. In 2012, he moved to the Sea Cliff neighborhood of San Francisco, where he has continued to reside. He is known for maintaining a daily meditation practice, having completed a ten-day Vipassana meditation retreat in late 2017 and a similar retreat in Myanmar in November 2018.