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October 13TH, 2015: Washington, D.C. Fortune Most Powerful Women 2015 Summit  LEADERSHIP: BOARDS Mellody Hobson, President, Ariel Invenstments Nancy Peretsman, Managing Director and Executive Vice President of Allen & Company Pat Russo, Chairman-Elect, Hewlett Packard Enterprise, Director, General Motors, Alcoa and Merck, Chairman, Partnership at Drugfree.org Moderator:Jennifer Reingold, Fortune Hosted by Deloitte Photograph by Rebecca Greenfield/Fortune Most Powerful Women