East River Source Control is a multidisciplinary group of engineers, building the primitive tooling that will underpin the next generation of software.

Benjamin Brittain
Chief Executive Officer
Benjamin is a co-founder of ERSC. He previously worked on operating systems and hypervisors at Google and was most recently Director of Core Engineering at Tower Research Capital, where he led developer tools. A longtime open source contributor, he believes developers (and perhaps agents) deserve better tools.

Steve Klabnik
Chief Product Officer
Before joining ERSC, Steve spent more than a decade helping build the Rust programming language, co-authored the book “The Rust Programming Language,” and worked at Oxide Computer Company, Cloudflare, and many others over his 10+ years in the field. Steve has spent his career building open-source developer tools and explaining complex technical ideas through writing and speaking engagements.

Martin von Zweigbergk
Chief Technology Officer
Martin has worked on version control since 2013. He started the Jujutsu (
jj) open-source project.Before joining ERSC, he worked at Google for almost 15 years, of which 4 were spent building their Jujutsu-based VCS solution.

Austin Seipp
Founding Member of Technical Staff
Austin has worked on open source software for almost 20 years; his first version control system was Darcs, and he is now one of the maintainers of Jujutsu. Before joining ERSC, he previously worked in software security, filesystem backup & recovery, and hardware/RTL design.
Before Jujutsu, he was known for his work in the Haskell community on the Glasgow Haskell Compiler, and has been a long time contributor to the Nixpkgs project.

David Barsky
Founding Member of Technical Staff
David Barsky is a co-founder of East River Source Control. He is a member of the Rust project’s rust-analyzer team. At Meta, he worked on the Rust developer experience, scaling it to one of the largest monorepos in the world. Before that, he worked at Amazon.

Brian Schroeder
Member of Technical Staff
Brian obsesses over the correctness and performance of ERSC’s storage layer. He’s scaled out knowledge graphs and search infrastructure at Dropbox, designed entity resolution systems behind industry-standard datasets at Gracenote, and built a symbolic execution system to help non-experts prove theorems about their programs.
Brian started his twenty-year career by revamping his first team’s build and version control infrastructure, and is now back where he started.

Conner Petzold
Member of Technical Staff
Conner works on products and lives and breathes usability. Throughout his career at mostly early-stage startups, he has built a wide variety of user interfaces, APIs, and successful teams. He’ll use that experience to help shape the next generation of VCS.

Ilya Grigoriev
Member of Technical Staff
Ilya is a Jujutsu maintainer and has contributed to jj since version 0.5.0 in 2022.
Before joining ERSC, Ilya worked at Google for 7 years. Prior to that, he was a mathematician, doing research in algebraic topology and teaching some wonderful students.

Keith Frost
Member of Technical Staff
Keith Frost has been writing software for more than three decades. He started in medical imaging at TriPath Imaging and as an algorithm scientist at Amnis, then moved on to Amazon, Audible, and Google. In New York, he built platform infrastructure at Tumblr, held lead engineering roles at the startup DWNLD/Verst, and spent over five years in core infrastructure engineering at Dropbox. At ERSC, he brings the full range of that experience to bear on source control software infrastructure and design.

Nick Gerace
Member of Technical Staff
Nick has worked on infrastructure software for his entire career. From wrangling Kubernetes clusters at Rancher Labs and SUSE to replacing Infrastructure-as-Code at System Initiative, he has always lived on the bleeding edge of the cloud. This passion extends to the next frontier: version control that scales beyond git.

Nick Noble
Member of Technical Staff
Nick Noble has spent nearly twenty years building for the internet: small, careful things, and big ones when the work demanded it. At tiny design studios, multinational megacorps, and everywhere between. Along the way he’s crafted tools, built teams to use them, and shaped the systems to support wonderful products. Off the clock, he designs tabletop games with his wife, collects tarot cards, and tends to two self-absorbed cats.