David has over 20 years of experience as a process design engineer and ebullated-bed technology expert at Axens NA, and more recently as leader of the digital application development team. He has performed various engineering duties ranging from process design, dynamic simulator design, and technical services for various petroleum refinery units with emphasis on heavy oil upgrading (H-Oil), direct coal liquefaction, gasoline desulfurization, diesel hydrotreating, and fixed-bed hydrocracking. David has taken a lead role in simulation and model development for both steady-state and dynamic environments, from reaction modeling through training utilizing the simulators. Throughout his career he has performed reactor modelling, programming, simulation layout, and operator training through the use of dynamic simulators.