Harry Kalodner is a Co-Founder and CTO of Offchain Labs, where he plays a central role in creating the technical vision and innovation behind Arbitrum's advanced rollup technology. As part of the initial development team, Harry was instrumental in growing Arbitrum into the world's largest Layer 2 blockchain. He holds a Ph.D. in Computer Science from Princeton University, where his research focused on blockchain systems, security, and privacy. Before founding Offchain Labs, Harry worked as a software development intern at Apple in 2013.