Book excerpt: Positive leaders are able to dramatically expand their people's—and their own—capacity for excellence. And they accomplish this without enormous expenditures or huge heroic gestures. Here leading scholars—including Adam Grant, author of the bestselling Give and Take; positive organizational scholarship movement cofounders Kim Cameron and Robert Quinn; and thirteen more—describe how this is being done at companies such as Wells Fargo, Ford, Kelly Services, Burt's Bees, Connecticut's Griffin Hospital, the Michigan-based Zingerman's Community of Businesses, and many others. They show that, like the butterfly in Brazil whose flapping wings create a typhoon in Texas, you can create profound positive change in your organization through simple actions and attitude shifts.