Bart De Smet is a Senior Software Development Engineer on the Cloud Programmability Team at Microsoft, leading the development of Reactive Extensions (Rx) and various LINQ-related projects. Bart joined Microsoft in 2007 out of college, where he was a C# MVP for 4 years. He’s also a popular speaker on various international conferences, talking about language-related innovations, runtime technologies, and LINQ. His main interests include programming languages, runtimes, functional programming, and all sorts of theoretical foundations. In his spare free time, he enjoys hiking, a game of snooker, and brushing up on math, physics, and type system theory.