Nat Friedman is a prominent American technology executive and investor known for his significant contributions to the open-source software community. He co-founded Xamarin, a mobile app development company, which was later acquired by Microsoft in 2016. Following the acquisition, Friedman became the CEO of GitHub, a subsidiary of Microsoft, where he served from 2018 to 2021. He is also an active investor in early-stage startups and continues to be an influential figure in the developer world.