We tend to associate philanthropy with great wealth, and some of America's wealthiest titans were great philanthropists. Andrew Carnegie built 3,000 libraries; Leland and Jane Stanford gave us Stanford University; others built research centers, museums and foundations. Each titan's largesse was compelled by different motivations. Some had public interest in mind while others sought refuge from taxes or vainglorious immortality. Paul P. Harris was not rich when he set out to form a business club in Chicago a hundred years ago, but the beneficial impact of his efforts on humanity equals or exceeds the gifts of the most generous titans.