Anders Hejlsberg is a Technical Fellow in the Developer Division. He is an influential creator of development tools and programming languages. He is the chief designer of the C# programming language and a key participant in the development of the Microsoft .NET framework. Since its initial release in 2000, the C# programming language has been widely adopted and is now standardized by ECMA and ISO. Before his work on C# and the .NET framework, Hejlsberg was an architect for Visual J++ development and the Windows Foundation classes.

Before joining Microsoft in 1996, Hejlsberg was one of the first employees of Borland International Inc. As principal engineer, he was the original author of Turbo Pascal, a revolutionary integrated development environment, and chief architect of its successor, Delphi.