Steven Treese retired from Phillips 66 as the Hydroprocessing Team Lead in 2013; but continues to take on the occasional consulting assignment in process engineering and refining. He started his professional career with Union Oil Company of California in 1973 as a Research Engineer with a BS in Chemical Engineering from Washington State University. He followed company heritages through Unocal, Tosco, Phillips, ConocoPhillips, and Phillips 66. Steve's range of experience includes hydroprocessing, hydrogen, operations, process safety, catalyst development, utilities, sulfur recovery, geothermal, shale oil, nitrogen fertilizers, process design, procurement, and licensing. Steve is a licensed Professional Engineer with a handful of publications. He was on the 1994 NPRA Question and Answer Panel and was lead editor for the "Handbook of Petroleum Processing, 2nd Edition" (Springer, 2015). He has been an inventor on patents in diverse areas, including vessel internals, enhanced oil recovery, and hydroprocessing. He is a member of the American Institute of Chemical Engineers.

Steve's hobbies include woodworking, boating, fermentation, robotics, and photography. He is a mentor for FIRST Robotics Team 3049 in Bremerton, WA, USA.