Garner-based Stellar Industries announced the addition of Brad Tiedemann as the new manufacturing engineer manager. He replaces Tom Frederick, who recently retired. Tiedemann will be responsible for overseeing manufacturing processes. He most recently was a shift production manager at Graham Manufacturing and also spent several years at Hagie Manufacturing. Tiedemann, who holds degrees from NIACC and Buena Vista, lives in Mason City with his wife and three children.