I am a Principal Researcher at Microsoft Research, Cambridge. I work with researchers, Microsoft and open source communities to make better programming technologies, and, through that, make people more productive and happier. My main responsibility is the design and implementation of the F# programming language. I’ve also worked on the design of virtual machines, the C# language (being co-responsible for C# and .NET generics, and one of many contributors to C# asynchronous programming) and, indirectly, Visual Basic and other .NET languages.