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Harry Kalodner

Harry Kalodner

Co-Founder & CTO of Offchain Labs; Co-Creator of Arbitrum, Offchain Labs

Offchain Labs website

Bio

Harry Kalodner is the Co-Founder and Chief Technology Officer of Offchain Labs, the company behind Arbitrum. He was a PhD candidate at Princeton University researching distributed systems, privacy and blockchain technology under Professor Ed Felten before co-founding Offchain Labs.

Kalodner co-authored the original Arbitrum research paper in 2018 alongside Steven Goldfeder and Ed Felten. The paper described an optimistic rollup protocol that moves smart-contract execution off-chain while maintaining Ethereum's security guarantees through on-chain fraud proofs. As CTO, Kalodner has led the engineering team that built Arbitrum One, Arbitrum Nova and the broader Arbitrum technology stack.

His earlier research at Princeton included work on blockchain privacy, transaction graph analysis and the economics of mining. As CTO, he oversees the technical architecture and engineering execution across Offchain Labs' product portfolio, including the 2024 acquisition and integration of the Prysm consensus client. Information last checked: August 2026.

Profile at a glance

Country
USA
Status
Active

Work & Project Background

  • Offchain Labs

    Co-founder

  • Arbitrum

    Co-founder

Key Contributions

Arbitrum Protocol Co-Creation

Co-authored the original Arbitrum research paper and co-created the optimistic rollup protocol.

Engineering Leadership

As CTO, led the engineering team that built Arbitrum One, Arbitrum Nova and the full Arbitrum technology stack.

Privacy Research

Published academic research on blockchain privacy, transaction graph analysis and deanonymization risks.

Prysm Integration

Led the technical integration of the Prysm consensus client following Offchain Labs' 2024 acquisition.

Distributed Systems Research

Contributed to academic research on distributed systems and their application to blockchain consensus and scaling.

Timeline

Pre-2018

PhD candidate at Princeton University researching distributed systems, privacy and blockchain under Ed Felten.

2018

Co-authored the Arbitrum paper; co-founded Offchain Labs with Goldfeder and Felten.

2021

Arbitrum One mainnet launched; Kalodner led engineering as CTO.

2022

Arbitrum Nova launched; Arbitrum ecosystem expanded rapidly with DeFi, gaming and infrastructure dApps.

2024–2026

Led engineering through Prysm acquisition; continued as CTO driving Arbitrum's technical roadmap.

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