Erik Meijer
Before joining Microsoft, Erik was associate professor at Utrecht University where he worked on languages such as Haskell, XMLambda, and Mondrian and directed the Microsoft lab (now defunct). He is currently working on .NET language and type-system support for bridging object-oriented (CLR), relational (SQL), and hierarchical (XML) data with first-class functions. He is a regular contributor to Lambda-The-Ultimate.org.