PQ Corporation: Jerry E. Sheridan was appointed executive vice president of PQ, and president and chief executive officer of subsidiary Potters Industries. He formerly served as chief financial officer. William J. Levy was appointed vice president and chief financial officer. He previously served as treasurer and director of business decision support. Mr. Levy is a member of the Association of Financial Professionals and the Pennsylvania Institute of Certified Public Accountants. Amy E. Ard was promoted from corporate controller to treasurer.