John Edwards is a consultant engineer at P & I Design Ltd., Stockon-on-Tees, England, a consulting firm that specializes in process engineering and instrumentation. He spent ten years at operating and control companies in the U.S. and U.K. before founding the firm in 1978. He is responsible for process modeling/simulation and online optimization as well as training simulator and process software developments. He gives seminars on topics related to simulation such as the selection of thermodynamic methods.