Kurt Jaegers is an Oracle Database Administrator and Windows network Admin, as well as a long-time hobbyist game developer. He has built games for everything from the Commodore 64 to the Xbox 360. He is the owner of http://www.xnaresources.com, and the author of XNA Game Development by Example, Packt Publishing for both C# and Visual Basic, and XNA 4 3D Game Development by Example, Packt Publishing.
Justin Witol grew up programming and he loved it ever since he was young when his mother first introduced him to Basic. For the past few years he has been working on game programming and has been developing an open source game engine for practice. He helps out within the community mainly dealing with C# and XNA, but at times he helps out in other fields as well, so when asked about reviewing this book he immediately responded with a yes. He hopes the book has helped to further your understanding of not only game development but programming in general. If you ever have any questions or just need some help with something dealing with programming feel free to stop by his website at www.WitolProductions.com and just ask.
Cătălin Zima-Zegreanu is very passionate about game design and development. He has been working with games and graphics technologies for more than the last seven years. He has been awarded the title of Microsoft MVP for DirectX/XNA for five years, in recognition of his expertise and dedication to the technology. At the moment, he is designing and developing mobile games with an awesome team, and enjoying life with awesome family and friends.