Over the past seventy years, World Vision has grown from a small missionary agency to the largest Christian humanitarian organization in the world, with 40,000 employees, offices in nearly one hundred countries, and an annual budget of over $2 billion. While founder Bob Pierce was an evangelist with street smarts, the most recent World Vision U.S. presidents move with ease between megachurches, the boardrooms of Fortune 500 companies, and the corridors...