What Makes a Great Leader? Editor-in-chief Amy Cosper on the many aspects of leadership.

Alexander the Great persevered against all odds. He conquered cities and entire regions deftly, with a shrewd genius that still baffles military experts. So cunning was his strategy, in fact, that on certain occasions he simply showed up, threw down his flag and proclaimed the chosen territory "Alexandria." With his troops always near, Alexander changed the borders of Egypt, Asia and Persia by uniting different ethnicities and fusing tribal customs. And in so doing, he changed the culture of the ancient world and laid the foundation for the region today.

History is a powerful teacher and one that comes with plenty of business lessons--from both heroic leaders and failed ones. Alexander was a hero and a warrior, yes, but first and foremost, he was a leader. He inspired, rewarded and acknowledged those who fought alongside him. He instilled confidence and trust. His soldiers were willing to follow him anywhere.