Donald E. Vandergriff, United States Army (Ret.), is a teacher, writer and lecturer who specializes in military leadership education and training. Vandergriff served with the United States Marine Corps and United States Army. He retired after 24 years of service. He holds a Bachelor’s degree in education from the University of Tennessee and a Master’s degree in military history from American Military University. He was the first major from the Army to lecture at the Naval War College. He is a frequently published authority on the U.S. Army personnel system, Army culture, leadership development, soldier training, and the emergence of Fourth Generation Warfare. He has authored many articles and briefings, as well as four books.