Mark Darby is a consultant to the Petrochemical, Refining, and Oil and Gas industries where he provides control consulting services in the design and implementation of advanced process control. Previously he held a number of technical and management positions at Setpoint and AspenTech. Mark has been a member of AIChE since 1980. He is currently a director of the Fuels and Petrochemical Division and serves as chair of the Advanced Control and Optimization Session. Mark is also a Lecturer at the University of Houston and serves on the advisory board for the Chemical Engineering Dept. at Texas Tech University. Mark received a BS from Texas Tech University and a PhD from University of Houston. He is a registered PE in the state of Texas.