He said that at some point after his arrival at graduate school, in London, he had had a sudden realization: that he had made a mistake, and the crucial formula that he had used in his thesis, the one that had won him the prize, was incorrect.

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The responsibility and expectations I welcomed, and there was a wide group of university leaders, alumni, faculty, staff and students who seemed excited about my arrival at a time when the business school was in transition.

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An armed police officer is assigned to the school, but he wasn't at the school at the time of the shooting because snowfall in the area prevented his arrival, authorities said.

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