Our youngest leaders matured in the glow of computer screens; our oldest in the shadow of the Depression and World War II. In a groundbreaking study of these two disparate groups - affectionately labeled "geeks" and "geezers" - leadership experts Warren G. Bennis and Robert J. Thomas set out to find how era and values shape those who lead. What they discovered was something even more profound: the powerful process through which leaders of any era emerge.