Wilmington, MA-MKS Instruments, Inc. a leading worldwide provider of process control technologies for improving productivity in semiconductor and other advanced manufacturing processes, today announced that its Board of Directors elected Leo Berlinghieri to the position of President and Chief Operating Officer. He previously served as Vice President and Chief Operating Officer. Mr. Berlinghieri continues to report to John R. Bertucci, who resigned his position as President and continues as Chairman and Chief Executive Officer.