Anders Hejlsberg, C#, the .NET Framework, and TypeScript
The last time Anders Hejlsberg wrote a language at Microsoft, it turned out to be a big deal in the sense that we got the C# programming language. This introduction of C# in turn was intricately tied to the .NET Framework, which is a gigantic mountain of code that has served Microsoft as a solid development platform for over a decade.
Accordingly, I think it's fair to say that Anders has my attention, given that one of the big benefits that TypeScript offers is additional annotations that enable type safety.
Is TypeScript the Way of the Future?