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David Langworthy, Brad Lovering, and Don Box (Redmond, WA) are developers on Microsoft's "Oslo" project and were the original three members of the M language team. David, Brad, and Don have worked together on languages, protocols, and runtimes, most recently on the Windows Communication Foundation (WCF). Brad is a Microsoft technical fellow - Microsoft's top technical honor. Don has written several previous books, including the bestselling Essential COM.