William C. Byham Ph.D.

William C. Byham, Ph.D., is Executive Chairman of DDI. He cofounded the company in 1970 and has worked with hundreds of the world’s largest organizations on executive assessment, executive development, and succession management. Bill authored Zapp!® The Lightning of Empowerment, a groundbreaking book that has sold more than 3 million copies. He has coauthored 23 other books, including seminal works on the assessment center method.