Chris Sells is a Program Manager for the Connected Systems Division at Microsoft. He's written several books, including the first edition of "Programming WPF", "Windows Forms 2.0 Programming" and "ATL Internals" (both Addison-Wesley). In his free time, Chris hosts various conferences and makes a pest of himself on Microsoft internal product team discussion lists. More information about Chris, and his various projects, is available at http://www.sellsbrothers.com
Ian Griffiths is an independent WPF consultant, developer, speaker and Pluralsight instructor and a widely recognized expert on the subject. He lives in London but can often be found on various developer mailing lists and newsgroups, where a popular sport is to see who can get him to write the longest email in reply to the shortest possible question. Ian maintains a popular blog at http://www.interact-sw.co.uk/iangblog/ and is co-author of "Windows Forms in a Nutshell" and of "Mastering Visual Studio .NET".