No. 17: William A. and Karen Ackman
By Caroline Preston (The Chronicle of Philanthropy) – Mr. Ackman, 44, and his wife, Karen, gave $58-million to the Pershing Square Foundation in 2010, which they created in 2006 to support education, human rights, social entrepreneurship, and other causes. They contributed an additional $1.3-million to 50 other nonprofits.