William C. Diehl is assistant professor and coordinator of online graduate programs in the Lifelong Learning and Adult Education program at The Pennsylvania State University. He also serves as associate editor for The American Journal of Distance Education and is an expert reviewer for other academic journals. He is the director of The American Center for the Study of Distance Education and the founder of the International Museum of Distance Education and Technology. Dr. Diehl is the co-editor of the Handbook of Distance Education 4th Edition and author of numerous book chapters, articles in academic journals, and proceedings at academic conferences. A consultant in the corporate, higher education, and government sectors, his professional experience also includes work as K-12 teacher, technologist, web designer and developer, instructional designer, and multimedia consultant.