Dave Geddes is a refinery economics and planning consultant. He managed the PIMS LP Software Group at Bechtel Corporation during its initial development and for many years thereafter. More recently he has been involved in updating client refinery LP models. He has built a number of refinery models for use in feasibility studies for clients around the world. His services also include training for both PIMS and PETRO LP planning systems. In addition, Dave teaches a short course in Petroleum Refining Economics and Planning at the Colorado School of Mines, and at client locations. Dave holds a B.S. degree in Petroleum Refining from the Colorado School of Mines and an M.S. degree in Chemical Engineering from the University of Colorado.