New York City Mayor Michael Bloomberg, left, appoints publishing executive Cathleen Black as chancellor of the city's school system.
What kind of credentials do you need to run a school district? Especially a really big one? Is a degree in education a better predictor of a superintendent's success than, say, a track record of turning around distressed companies? These are hot questions in the education world right now. Last week, New York City Mayor Michael Bloomberg surprised everyone (and that includes the senior leaders of his city's school system) by tapping publishing executive Cathleen Black to be the city's new school chancellor. By doing so, Bloomberg set in motion an arcane deliberation process. Because Black has not spent three years working in public schools — in fact, her only education