Charles Pappis has served as a director of ACM Research since March 2025 and is an independent director, chairing the Nominating and Governance Committee and serving on the Audit Committee. He has been President of Pappis Consulting since April 2016, and previously served as a Vice President and General Manager at Applied Materials from 1986 to 2016. He received a Bachelor of Science in Materials Science from Worcester Polytechnic Institute and an Executive MBA from Stanford University.