Ruth Colvin Clark is a recognized specialist in instructional design and evidence-based practice. She holds a doctorate in educational psychology and instructional technology from the University of Southern California. She has worked as a consultant, instructor, speaker, and writer for the past thirty years. Dr. Clark is a past president of the International Society for Performance Improvement and was honored in 2006 with the Thomas F. Gilbert Award for Distinguished Professional Achievement. Dr. Clark has authored seven books that translate instructional research into guidelines for practitioners, including the best-selling e-Learning and the Science of Instruction, co-authored with Dr. Richard E. Mayer, as well as Evidence-Based Training Methods (2nd ed.) (2014).

Richard E. Mayer is a professor of psychology at the University of California, Santa Barbara. His research interests are applying the science of learning to education, with a focus on multimedia learning. He has served as president of Division 15 (Educational Psychology) of the American Psychological Association and vice president of the American Educational Research Association for Division C (Learning and Instruction). He is the winner of the Thorndike Award for career achievement in educational psychology, the Scribner Award for outstanding research in learning and instruction, and the Distinguished Contribution of Applications of Psychology to Education and Training Award, and is ranked number one as the most productive educational psychologist in the world in Contemporary Educational Psychology. Dr. Mayer serves on the editorial boards of twelve journals, mainly in educational psychology. He is the author or editor of more than 500 publications, including thirty books, such as Learning as a Generative Activity (with L. Fiorella, 2015), Computer Games for Learning (2014), Cambridge Handbook of Multimedia Learning: Second Edition (editor, 2014), Handbook of Research on Learning and Instruction (co-editor with P. Alexander, 2011), Applying the Science of Learning (2011), Multimedia Learning: Second Edition (2009), and Learning and Instruction: Second Edition (2008).

The authors can be reached at [email protected] or [email protected].