He is also a co-founder of Wintellect, a software consulting and training company. He has authored many videos available on WintellectNOW, has spoken at many industry conferences, and is the author of several best-selling Windows and .NET Framework programming books including Windows Runtime via C#, CLR via C#, 4th Edition, and Windows via C/C++, 5th Edition. Jeffrey has also been a contributing editor to MSDN Magazine where he authored many feature articles and columns.