Joseph “Joe” Lubin is a co-founder of Ethereum and founder of ConsenSys — the Brooklyn-based blockchain software company that created MetaMask (the world’s most-used self-custody wallet with 30M+ monthly active users), Infura (the dominant Ethereum RPC infrastructure provider), Truffle Suite (developer tooling), Diligence (smart contract auditing), and dozens of other foundational protocols and applications powering the Ethereum ecosystem; Lubin’s role at Ethereum was primarily as a financier and organizer in the early phase, and his subsequent focus has been building ConsenSys into the premier full-stack Ethereum platform company.
Background
Joseph Lubin was born in Toronto, Canada, and attended Princeton University, where he studied electrical engineering and computer science. He worked in software development at Goldman Sachs and ran a hedge fund in Jamaica before pivoting to crypto. He became interested in Bitcoin around 2012 and connected with Vitalik Buterin’s Ethereum concept through the early community.
Role in Ethereum
Lubin was one of the original eight Ethereum co-founders who gathered in Zug, Switzerland in 2014 to formalize the Ethereum project. His primary contribution was financial and organizational: he reportedly provided early funding from accumulated Bitcoin holdings and helped establish the Ethereum Foundation. He is credited alongside Vitalik Buterin, Gavin Wood, Charles Hoskinson, Anthony Di Iorio, Mihai Alisie, Amir Chetrit, and Jeffrey Wilcke as a founding member.
ConsenSys
Lubin founded ConsenSys in 2014 (officially active from 2015), building it into the largest Ethereum-focused software company. Major products:
| Product | Role |
|---|---|
| MetaMask | Browser extension and mobile self-custody crypto wallet; 30M+ MAU |
| Infura | Ethereum and IPFS RPC API infrastructure; powers most major dApps |
| Truffle Suite | Smart contract development framework (later merged into MetaMask ecosystem) |
| Codefi | DeFi and NFT infrastructure tools |
| Diligence | Smart contract security auditing firm |
| Quorum | Enterprise Ethereum private chain (originally built for JPMorgan) |
| Linea | ConsenSys’s zkEVM Layer 2 network (launched 2023) |
ConsenSys Funding Rounds
ConsenSys underwent a significant restructuring in 2020, splitting into “ConsenSys AG” (software/products) and a separate holding company structure. It raised:
- $65M Series A (2021)
- $200M Series B (March 2022, valuation $7B)
- $450M Series C (November 2022, valuation $7B maintained despite bear market)
Linea
ConsenSys launched Linea, an EVM-equivalent zkEVM Layer 2, in July 2023. It uses Prover technology developed internally and competes with zkSync Era, Scroll, and Polygon zkEVM. Linea is notable for being directly integrated into MetaMask.
Key Dates
- 2012 — Discovers Bitcoin; begins transition from traditional finance to crypto.
- January 2014 — Meets Vitalik Buterin; joins Ethereum founding group.
- July 2014 — Ethereum crowdsale raises ~$18M in Bitcoin.
- 2014–15 — Founds ConsenSys; MetaMask and Infura early development begins.
- 2018 — MetaMask mobile launches; Infura becomes critical infrastructure (later cited in OFAC Tornado Cash controversy for blocking certain addresses).
- 2020 — ConsenSys restructures.
- July 2023 — Linea zkEVM mainnet launches.
Common Misconceptions
- “Joe Lubin wrote Ethereum’s code.” — Lubin’s primary Ethereum contributions were organizational and financial. The core technical work was done by Vitalik Buterin, Gavin Wood (Yellow Paper/EVM), and other core developers.
- “ConsenSys is decentralized.” — ConsenSys is a private company with significant commercial interests in the Ethereum ecosystem; critics note potential conflicts of interest given Infura’s infrastructure centrality.
Last updated: 2026-04