Most of them--like Bill Gates, Warren Buffett, or Michael Bloomberg--come from a business background, and while they're prepared to give their money away, they want to get the maximal bang for their charitable bucks. Others, like Bono or Oprah Winfrey, are celebrities who are deploying their fame as well as their money--but they too understand the concept of leverage. All together, this class of megadonors is truly changing the world. Not only because their money is making a difference, but because their strategies and tools are making many organizations more savvy and effective. So the book has something to say to anyone interested in social entrepreneurship, NGOs, or volunteerism.
Bishop and Green have recently launched a very lively website with lots of information on this topic, and one-one-one interviews with figures such as Bill Gates. Worth a visit if you are involved in charity, volunteering, or you are trying to figure out with to do with a spare billion.