How a Hedge-Fund Manager Gives to Improve Public Schools

William A. Ackman, the hedge-fund manager, typically makes “long” investments in companies he expects will become more valuable over time—and he says he’s prepared to take the long view in judging his biggest contribution to date, turning around troubled schools in Newark, N.J.

Mr. Ackman—who, along with his wife, Karen, is No. 17 on The Chronicle’s annual list of America’s most-generous donors—in September pledged $25-million

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