MINNEAPOLIS--(BUSINESS WIRE)--Tennant Company (NYSE: TNC), a world leader in designing, manufacturing and marketing solutions that help create a cleaner, safer, healthier world, today announces the hiring of Jeffrey C. Moorefield as Senior Vice President of Global Operations, replacing Don Westman who will retire on June 2, 2015, after nine years with the company. Mr. Moorefield comes to Tennant from Minneapolis-based Pentair, Inc., where his most recent position was Global VP of Operations-Tec