He and Godfrey Stillman Rockefeller were stockholders in the Enterprise Development Corporation, a closed end investment trust for the heirs of William Rockefeller and Thomas Fortune Ryan, Clendenin's entrepreneurial grandfather, who invested heavily in Copper Mining and ore smelting.
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In 1935 the Board of Directors included chairman John Hay Whitney, Kidder, Peabody & Co., Eugene L. Norton, Langbourne M. Williams Jr. (president), Monro B. Lanier, Chauncey Stillman, Godfrey Stillman Rockefeller, David M. Goodrich.