National Science Foundation | Ford Foundation | Rockefeller Foundation | John Marshall | Marshall Islands | Marshall | Marshall Plan | Thurgood Marshall | Marshall Space Flight Center | John Simon Guggenheim Memorial Foundation | Electronic Frontier Foundation | Bill & Melinda Gates Foundation | New York Foundation for the Arts | Marshall McLuhan | Mozilla Foundation | Guggenheim Foundation | Penny Marshall | Alexander von Humboldt Foundation | Andrew W. Mellon Foundation | Wikimedia Foundation | Apache Software Foundation | Marshall Crenshaw | John Marshall Harlan II | foundation | Marshall Amplification | George C. Marshall European Center for Security Studies | Alfred Marshall | Make-A-Wish Foundation | John Marshall Harlan | John D. and Catherine T. MacArthur Foundation |
Petersen was chairman of the boards of the Institute for Advanced Study in Princeton, New Jersey, the University of Pennsylvania Museum, and the Marshall Foundation, and chairman and advisory committee member of Export-Import Bank.