Phil Haack (yes, it's pronounced "hack") works at GitHub as an Engineering Manager for the Desktop team. This team is responsible for GitHub for Mac, GitHub for Window, and other interesting applications. Prior to GitHub, he was a Senior Program Manager at Microsoft responsible for shipping ASP.NET MVC and NuGet. These projects were released under open source licenses and helped served as examples to other teams for how to ship open source software.
He regularly writes for his blog http://haacked.com/ and tweets random observations on Twitter as @haacked. He also speakns at conferences here and there, and has quit writing technical books forever several times now.