Ziewacz served as Chief of Staff to a Wisconsin Congressman in Washington, DC; and, as Executive Director of national cooperative development entities. She has managed the legislative agenda at the state and national levels for cooperative trade associations representing all sizes and sectors of the U.S. economy including Fortune 500 agriculture cooperatives and minority-owned catering businesses; farm credit banks and consumer credit unions; New York City and rural, senior housing; urban food stores and rural energy services.