Gaston C. Hillar has been working with computers since he was eight. He began programming with the legendary Texas TI-99/4A and Commodore 64 home computers in the early 80s. He has a Bachelor degree in Computer Science, graduated with honors, and an MBA (Master in Business Administration), graduated with an outstanding thesis. He worked as developer, architect, and project manager for many companies in Buenos Aires, Argentina. Now, he is an independent IT consultant and a freelance author always looking for new adventures around the world. He also works with electronics (he is an electronics technician). He is always researching about new technologies and writing about them. He owns an IT and electronics laboratory with many servers, monitors, and measuring instruments. Gaston write the C# 2008 and 2005 Threaded Programming: Beginner's Guide also published by Packt. He is also the author of more than 40 books in Spanish about computer science, modern hardware, programming, systems development, software architecture, business applications, balanced scorecard applications, IT project management, the Internet, and electronics. He contributes to Dr. Dobb's Go Parallel programming portal http://www.ddj.com/go-parallel/ and he is a guest blogger at Intel Software Network http://software.intel.com He usually writes articles for Spanish magazines Mundo Linux, Solo Programadores and Resistor. Gill Cleeren is a Microsoft Regional Director, MVP ASP.NET, INETA speaker bureau member, and Silverlight Insider. He lives in Belgium where he works as .NET architect at Ordina. Since its introduction, Gill has been a .NET enthusiast. For the first several years of his career, he developed ASP.NET applications. The day Silverlight was introduced to the world, back in 2007, he started working with the technology. Since then, he has given many training sessions and developed several applications, both with Silverlight and WPF. As MVP and Regional Director, Gill is also very active in the Belgian and international community as a speaker and user group leader for Visug, the Belgian .NET user group. His blog on .NET, ASP.NET and Silverlight can be found on http://www.snowball.be Kevin Dockx lives in Belgium and works at RealDolmen, one of Belgium's biggest ICT companies, where he is a technical specialist/project leader on .NET web applications, mainly Silverlight, and a solution manager for Rich Applications (Silverlight, WPF, Surface). His main focus lies on all things Silverlight, but he still keeps an eye on the new developments concerning other products from the Microsoft .NET (Web) Stack. As a Silverlight enthusiast, he's a regular speaker on various national and international events, like Microsoft DevDays in The Netherlands or on BESUG events (the Belgian Silverlight User Group). His blog, which contains various tidbits on Silverlight, .NET, and the occasional rambling, can be found at http://blog.kevindockx.com.