Esther Derby draws on four decades of experience leading, observing, and living organizational change. She works with a broad array of organizations. Based on experience and research, her approach blends attention to humans and deep knowledge of complex adaptive systems. Through her writing, workshops and consulting, she has influenced a generation of leaders in the software industry. Diana Larsen contributes to the foundations and extensions of agile thought as consultant, mentor, and speaker. She has co-authored six books, including LiftOff: Start and Sustain Successful Agile Teams, also published by Pragmatic Bookshelf. Her theme of learning and improvement is central to the practice of cultivating team agility. David Horowitz is the co-founder and CEO of Retrium, the world's leading platform for agile retrospectives that is used by thousands of companies across the world. Prior to co-founding Retrium, David spent a decade at The World Bank and International Finance Corporation as a software developer turned agile coach.