More than halfway through Joel Klein’s forthcoming book on his time as the chancellor of New York City’s public schools, he zeros in on what he calls “the biggest factor in the education equation.” It’s not classroom size, school choice or the Common Core. It’s “teacher quality,” he writes, adding that “a great teacher can rescue a child from a life of struggle.” We keep coming back to this. As we wrestle with the urgent, dire need to improve education — for the sake of social mobility, for the sake of our economic standing in the world — the performance of teachers inevitably draws increased scrutiny. But it...
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