Bart De Smet is a Principal Software Development Engineer working on large scale stream processing systems in the Applications and Services Division at Microsoft Corporation, a course and book author, and a popular speaker on various international conferences. In his current role at Microsoft, he’s overseeing the architecture, design, and implementation of event processing systems that run at massive scale in data centers, as well as on cloud-connected devices. One of the publicly visible technologies powered by this infrastructure is Cortana. Prior to joining the Applications and Services Division, Bart was involved with the design and implementation of Reactive Extensions for .NET (Rx) and on an extended “LINQ to Anything” mission back in the SQL organization. Going even further, you could have found Bart in the Developer Division hacking away on the Application Model feature area in the Windows Presentation Foundation (WPF) in the .NET 3.5 and 4.0 days. His main interests include programming languages, runtimes, functional programming, and all sorts of theoretical foundations. Before joining the company, Bart was a C# MVP for four years, while completing his Master of Civil Engineering and Computer Science studies at Ghent University, Belgium. Bart is also the author of the C# 5.0 Unleashed book (and its predecessor) by SAMS, and an author of online courses at Pluralsight for topics such as C# language internals.