Mark is Technology Manager for the instrumentation group (formerly Particle Sizing Systems) at Entegris, Inc. Mark has worked in the field of particle size analysis for over thirty-five years. He has served as a member of the expert committee for USP 788, the executive committee of the International Fine Particle Research Institute, and the executive committee of Particle Technology Forum of the American Institute of Chemical Engineers. Mark is an active member of ISO Technical Committee 24, SC4 helping to write standards for particle size and zeta potential analysis.