David McCullough was encouraged by the success of his first book, The Johnstown Flood, but he was still faced with a difficult decision, to trade a steady and satisfying job for the insecurities of life as a full-time writer with a growing family to support. With his wife's encouragement, he took the plunge and has never looked back. Today he is a best-selling author, and one of America's most distinguished historians. He has received not one but two Pulitzer Prizes, for John Adams and for Truman, both biographies of Presidents of the United States. He has also won two...