With 35 years of software and systems engineering experience, Rex Black is President of RBCS (www.rbcs-us.com), a testing leader, providing consulting, training, and expert services. RBCS has over 100 clients on six continents, spanning all areas of software and system development, from embedded systems to gaming software to banking and insurance to pharmaceuticals to defense systems. He has worked with clients from small start-ups to Fortune 20 global enterprises. He has experience helping clients apply testing best practices in a wide variety of development lifecycles, including Kanban, Scrum, DevOps, Waterfall, and Spiral. Rex is the most prolific author practicing in the field of software testing today, having written fourteen books and dozens of articles over the last 20 years. He is past President of the ISTQB and of the ASTQB, a co-author of many of the ISTQB syllabi, and Chair of the Agile Working Group, and past Chair of the Advanced Test Manager Working Group, and the Expert Test Manager Working Group.