William Bailey, SPE, is a principal at Schlumberger-Doll Research in Cambridge, Massachusetts. His primary technical interests lie in reservoir engineering, multiphase flow in conduits, and optimization of expensive functions. Bailey has contributed to 57 articles and holds 12 patents. He holds MEng and PhD degrees in petroleum engineering and an MBA degree. Bailey has held various positions in SPE, including as technical reviewer for various SPE journals and as a member of the Reservoir Description and Dynamics Committee, and was the chair of the SPE Books Development Committee, on which he still serves.