IMPACT

William A. Ackman, Hedge-Fund Manager, Brings Financial Know-How To Philanthropy

02/20/2011 12:09 pm ET | Updated May 25, 2011

A few years ago, Cheryl L. Dorsey was hosting a lunch for Echoing Green Foundation, the social-entrepreneurship fund she runs, when a man she had never met before approached her.

"If Echoing Green is as good as you say it is, I'll commit $1-million and get involved," she recalls him saying.

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