George M Jacobs is an educator from Singapore. His primary research interests are student-centered instruction, cooperative learning, humane education, environmental education, teacher education and positive education. His two main roles are teaching student-centered approaches to in-service teachers in a variety of fields, and teaching in the non-formal education sector for non-profit organisations. He is also active in professional associations, such as the Extensive Reading Foundation and the International Ecolinguistics Association. George has published more than 260 articles, book chapters, and books on topics related to this book. He regularly conducts workshops and courses for teachers on cooperative learning and other student centered themes. Dr Willy A Renandya is a language teacher educator with extensive teaching experience in Asia. He currently teaches applied linguistics courses at the National Institute of Education, Nanyang Technological University, Singapore. He has given numerous plenary presentations at regional and international conferences, and published extensively in the area of second language education. His latest publications include Motivation in the language classroom (2014, TESOL International), Simple, powerful strategies for Student Centered Learning with George Jacobs and Michael Power (2016, Springer International), and Cooperative Learning in Language Education (2018) with George Jacobs. He maintains an active language teacher professional development forum called Teacher Voices.