Branch Address - Southfield Suite 300, 24300 Southfield Road Southfield 48075 P: 248-483-3170 Get Directions Local Contacts Mr. Mike Licata Vice President of Sales Phone: 248-727-8050 Mike.Licata@gdi.com Ms. Laura Horton Michigan Operations Director Phone: 586-457-7288 laura.horton@gdi.com Ms. Sandra Gronau Vice President of Human Resources & Administration Phone: 734-637-3236 sandra.gronau@gdi.com