William J. Rothwell is Distinguished Professor of Education at Penn State University, USA. As a globally recognized expert in the fields of Human Resource Development (HRD), Human Performance Technology (HPT), and Organization Development (OD), he has spent over four decades shaping the theory and practice of the fields in which he works. He has authored over 170 books and articles and is a sought-after speaker, researcher, and consultant worldwide.Jae Young Lee is Assistant Professor of in the Department of Education Technology at Ewha Womans University, South Korea, specializing in Human Resource Development (HRD) and Organization Development (OD). She serves as the Editor-in-Chief of the Journal of Educational Science and as an Associate Editor for New Horizons in Adult Education and Human Resource Development.