Authors study geezers (leaders age seventy and over) and geeks (leaders age 35 and under) . They find a common set of characteristics in their subjects, the "Big Four" - adaptive capacity, engaging others by creating shared meaning, voice, and integrity.

s+b Best Business Books 2001-2002
The classics: Books that Shaped Management Thinking
LibraryJournal.com - Living with volatility: Best Business Books 2002

Leaders Are Made, Not Born: How Era, Values, and Defining Moments Shape Leaders (@ Business Week)