14 people serve on the board of directors of four S&P 500 companies at the same time. Of those 14, four are women, according to BoardEx data. BoardEx is a business unit of TheStreet. American physicist Dr. Shirley Ann Jackson serves on the board of four publicly traded companies: FedEx  (FDX) , Public Service Enterprise Group (PEG) , Medtronic (MDT)  and International Business Machines  (IBM) . Fellow FedEx director Susan Schwab also sits on four boards, including Caterpillar (CAT) , Boeing (BA)  and Marriott International  (MAR) . Suzanne Nora Johnson serves on the board of directors at Pfizer  (PFE) , Visa (V) , American International Group  (AIG)  and Intuit  (INTU) . Former CEO of Lucent Technologies, Patricia Russo is a director for Merck (MRK) , General Motors (GM) , Arconic  (ARNC)  and is the Chairman of the board for Hewlett Packard Enterprise  (HPE) .

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