You may think this question was answered long ago. Countless business authors and analysts have assured us that great leadership demands great character. Time and again, we've seen that truth play out, as once-thriving organizations falter and fail under the guidance of leaders behaving badly. Why, then, do so many executives remain skeptical about the true value of leadership character? A winning strategy and a sound business model are what really matter, they argue; character is just the icing on the cake.

What's been missing from this...