Babette Brinkmann is Professor of Organisational and Group Psychology at Cologne University of Applied Sciences. Brinkmann and Kump have extensively researched and taught the frameworks and core principles outlined in this book, refining their ideas through the coaching of more than 500 insider activists. Their consulting work spans major companies such as Siemens, 3M, Audi, Allianz, Telekom, A1, Saint Gobain, EWE, Daiichi Sankyo, and Eli Lilly & Company, where they've helped organisations adopt more sustainable practices.

Barbara Kump is Associate Professor of Business and Sustainability at the University of Twente. Brinkmann and Kump have extensively researched and taught the frameworks and core principles outlined in this book, refining their ideas through the coaching of more than 500 insider activists. Their consulting work spans major companies such as Siemens, 3M, Audi, Allianz, Telekom, A1, Saint Gobain, EWE, Daiichi Sankyo, and Eli Lilly & Company, where they've helped organisations adopt more sustainable practices.