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Mazzarella is a member of Graybar's board of directors and most recently served as executive vice president and chief operating officer. During her 32-year career with the employee-owned company, she has held leadership positions in sales, marketing, human resources and strategic planning. She holds an associate degree in telecommunications engineering, a bachelor's degree in applied behavioral sciences and a master's degree in business administration. In addition, Mazzarella serves on the boards of the St. Louis Regional Chamber and Growth Association (RCGA), NAW Institute and St. Louis Club. She also serves on the NAED Channel Advantage Partnership Council and the Advisory Board for the Webster University School of Business and Technology.