Scott Guggenheim is the most influential development expert that you've never heard of. The writer Rebecca Hamilton sits in for Mark today and interviews Guggenheim about his pioneering model of community driven economic development. This model has critics, but it was proven effective -- of all places -- in Afghanistan in the height of the insurgency. Guggenheim tells Hamilton how this model works, how he came up with it, his friendship with Ashraf Ghani, and his career as a maverick World Banker.