About
Jack Dorsey co-founded Twitter in 2006 and Square (now Block) in 2009, and is one of very few founders to have taken two companies public and served as CEO of both simultaneously. He was ousted from Twitter in 2008, returned as CEO in 2015, and left in 2021; he sold Twitter to Elon Musk in 2022. He now runs Block and funds Bitcoin and open-protocol work, including Bluesky and Nostr.
Co-founder at Square
Intro paths
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In turn, Jack can intro founders to Square's investors below.
Square's investors · 18
A*San Francisco · $500K – $3M checks · since 2021Cota CapitalSan Francisco · since 2021CrunchFundsince 2021FINTOP CapitalNashville · since 2021IDG CapitalHong Kong · $3M – $200M checks · since 2026Kleiner PerkinsMenlo Park · $500K – $15M checks · since 2021Muzinich & Co.since 2026Notable CapitalSilicon Valley · $5M – $50M checks · since 2021Omega Venture PartnersSilicon Valley · since 2021PruVen Capital PartnersLos Altos · $100K – $10M checks · since 2021Rizvi Traverse ManagementWest Palm Beach · $25M – $1B checks · since 2021Sapphire VenturesMenlo Park · $5M – $20M checks · since 2021Sequoia CapitalMenlo Park · $4.4M – $214M checks · since 2021Source Code CapitalBeijing · $2M – $200M checks · since 2026Sozo VenturesRedwood City · since 2021SV AngelSan Francisco · since 2021SWaN & Legend Venture PartnersLeesburg · since 2021Tuesday CapitalSan Francisco · since 2021
Co-founder & CEO at Block
Intro paths
→
In turn, Jack can intro founders to Block's investors below.
Frequently asked questions
- Who is Jack Dorsey?
- Jack Dorsey co-founded Twitter in 2006 and Square (now Block) in 2009, and is one of very few founders to have taken two companies public and served as CEO of both simultaneously. He was ousted from Twitter in 2008, returned as CEO in 2015, and left in 2021; he sold Twitter to Elon Musk in 2022. He now runs Block and funds Bitcoin and open-protocol work, including Bluesky and Nostr.
- Where does Jack Dorsey work?
- Jack Dorsey is Co-founder at Square and Co-founder & CEO at Block.
- What companies did Jack Dorsey found?
- Jack Dorsey founded Block, Square.
Paths to reach Jack
People who overlapped with Jack at the same organization — a shared school or employer with one of them is a warm way in.
Founder mafias
Square mafia2
Also came through, then founded or led a company.