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Markus Gärtner works as an Agile tester, trainer, coach and consultant with it-agile GmbH, Hamburg, Germany. Markus, a student of the work of Jerry Weinberg, founded the German Agile Testing and Exploratory workshop in 2011, is one of the founders of the European chapter in Weekend Testing, a black-belt instructor in the Miagi-Do school of Software Testing, contributes to the Agile Alliance FTT-Patterns writing community as well as the Software Craftsmanship movement. Markus regularly presents at Agile and testing conferences all over the globe, as well as dedicating himself to writing about testing, foremost in an Agile context. He maintains a personal blog at http://www.shino.de/blog. He teaches ATDD as well as context-driven testing to customers in the Agile world. He has taught ATDD to testers with a non-technical background, as well as to several programmers.