Hi, I’m Justin! 👋

I'm currently doing independent game development as Fern Forest Games .

Previously, I worked at Anthropic , where I co-created the Model Context Protocol . Before that, I was at various other companies—notably Meta and GitHub—and did some independent consulting as well.

In a past life, I contributed significantly to some open source projects in the iOS and macOS ecosystem:

• ReactiveCocoa : reactive programming in Swift and Objective-C
• Mantle : a model framework for Cocoa
• Squirrel : robust software update framework for Mac apps
• Carthage : a decentralized dependency manager

I may not be able to respond to pings and reachouts—sorry in advance.