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"I was sweating bullets." Phillip Leslie is founder and CEO of ProOnGo, a Chicago company that makes expense-reporting software for smartphones.

University of Chicago Taught by: Craig Wortmann Though marketing courses are legion in business schools, sales classes are hen's-teeth rare. That's one reason Craig Wortmann's class feels so refreshing. The other reason is that Wortmann, a clinical associate professor and former CEO of two software companies, customizes material for the kind of scared and starving entrepreneur he once was.