Dennis Knol has worked for more than 10 years as a test engineer at various companies and on various projects. Due to his background as a developer, he started with automated testing. As it became more fun and interesting, he decided to continue with it. Over the course of several years, he has gathered a lot of experience with a broad selection of tools, such as Selenium, Rational Robot, HP Quick Test Pro, and TTWorkbench, and worked with several programming languages, such as Java, .NET, Visual Basic, and TTCN-3.