John T.C. Lee

Dr. Lee has served as President and Chief Executive Officer of MKS Instruments, Inc.(MKSI) since January 2020. Dr. Lee joined MKS in 2007 and has held a number of senior leadership positions, including President and Chief Operating Officer, Senior Vice President and Chief Operating Officer, and leadership roles managing various business units, culminating in Senior Vice President of Business Units.

Prior to joining MKS, Dr. Lee held senior management roles at Applied Materials, Inc. from 2002 to 2007, including Managing Director of Factory Technology and Projects within the Solar Business Group and General Manager of the Cleans Product Group and the Maydan Technology Center. Prior to Applied Materials, Dr. Lee served from 1997 until 2002 as Research Director of the Silicon Fabrication Research Department at Lucent Technologies, Inc. From 1991 until 1997, he was a Member of the Technical Staff in the Plasma Processing Research Group within Bell Labs.

He has served on the MKS Board of Directors since 2020 and on the board of directors of Cognex Corporation since 2022. He also serves as Chair of the Executive Committee of the Board of Directors of the Massachusetts High Technology Council since 2023 and has been a member since 2021.

Dr. Lee holds a B.S. from Princeton University and both an M.S.CEP and a PhD from the Massachusetts Institute of Technology, all in Chemical Engineering.