They deliver more capital to entrepreneurs than any other source.And they often receive an incredible return on their investments.They're angel investors, some of the most important--and leastunderstood--players in business today. The United States has closeto three million angels, whose investments in startups exceed $60billion per year. Some of our most successful companies were fundedby angels--companies like Ford, AOL, and Amazon.com. But until now,little has been written about these angels, due in part to theirpreference for anonymity. Angel Investors provides an inside lookat who these angels are and how they operate. It also showswould-be angels and entrepreneurs how best to find eachother.

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MARK VAN OSNABRUGGE is a consultant at Marakon Associates, a top-tier international consulting firm based in Stamford, Connecticut. A former fellow of the Harvard Business School, he is also the widely published author of articles about entrepreneurial finance. He lives in Chicago, Illinois. ROBERT J. ROBINSON is associate professor of negotiations at the Harvard Business School and an angel investor with experience in a variety of startup companies. He lives in Boston, Massachusetts.