Karl is number three on the list of most influential conversion experts in the world. He’s the G in AGConsult, a Belgium-based usability and conversion optimization company. He’s been optimizing websites since 2001. Always based on user research & facts, because he’s tired of all the opinions and gut feelings in the web business. The last few years he’s been obsessed with AB-testing. Mainly because it allows him to see the impact of changes he proposes based on research. But AB-testing also made Karl humble again. Because he noticed that best practices don’t always work. And that his great ideas and solutions sometimes utterly fail. Karl teaches at several university colleges in Belgium and speaks at conferences all over the world. He’s also known as the ‘conversion comedian’. He works for clients such as Suzuki, Thomas Cook, Tui, Shell and Daikin.