Markus Gärtner works as Certified Scrum Trainer (CST), coach and consultant for it-agile GmbH, Hamburg. Markus, author of ATDD by Example - A Practical Guide to Acceptance Test-Driven Development, a student of the work of Jerry Weinberg, received the Most Influential Agile Testing Professional Person Award in 2013, and contributes to the Softwerkskammer, the German Software Craftsmanship movement. Markus regularly presents at Agile and testing conferences all over the globe, as well as dedicating himself to writing about agile software development, software craftsmanship, and software testing, foremost in an Agile context. He maintains a personal blog at http://www.shino.de/blog. He teaches Scrum, TDD, ATDD and context-driven testing to customers in the Agile world.