 SALT LAKE CITY--BUSINESS WIRE--Zions Bancorporation, N.A. Nasdaq: ZION today announced Maria Contreras-Sweet was elected to its board of directors at its annual meeting of shareholders. Contreras-Sweet is managing member of both Contreras Sweet Companies, a marketing and research solutions business, and Rockway Equity Partners, a private equity firm. She served as 24th administrator of the U.S. Small Business Administration and as a member of former President Barack Obamas cabinet. Over he 