E. John List, Ph.D., P.E.

Principal Consultant


Dr. List is Principal Consultant of Flow Science and Emeritus Professor of Environmental Engineering Science at the California Institute of Technology. He has over 40 years of experience as a consulting engineer, including 20 years of litigation support experience.

Li Ding, Ph.D., P.E. (VA)

President and Principal Engineer


Dr. Li Ding is a Principal Engineer at Flow Science and is the technical lead for the Computational Fluid Dynamics (CFD) and and Surface Water Quality & Hydrodynamics groups. He has expertise in CFD software to perform detailed flow analyses within water/wastewater storage and treatment facilities, to design baffles, alternative inlet/outlet configurations, and mixing systems for improving water quality. He is also experienced in the use of the Stanford University Large Eddy Simulation (LES) model. Dr. Ding has conducted numerous hydrodynamic and water quality studies of lakes, reservoirs, and estuaries using the one and three-dimensional DYRESM and ELCOM/CAEDYM models. He is the author or co-author of several publications in refereed journals.

Mark Sauter, M.S., P.E. (CA)

Vice President and Principal Engineer


Mr. Sauter  heads the Hydraulic and Transient Analysis group. He gained comprehensive experience in the planning, design, construction and startup of wastewater treatment facilities while an employee for the City of Los Angeles and the County Sanitation Districts of Los Angeles County. His wastewater background serves as a specialized foundation for his applied experience in fluid flow analysis. With Flow Science, he has been responsible for the modeling and analysis of hydraulic transients in pipeline systems as a result of loss of power to pump stations, pump startup, and control valve operations and performs surge analyses for both water and wastewater systems.

Gang Zhao, Ph.D., P.E. (CA)

Principal Engineer


Dr. Zhao is currently a Principal Engineer at Flow Science. His field of specialization is hydrodynamics and water quality modeling. He also has experience in field tracer studies, hydrologic modeling, GIS analysis and NPDES permit applications. Dr. Zhao has primarily worked on hydrodynamic simulations of flows in rivers, estuaries, and coastal oceans, and analyses of wastewater discharge from diffusers. He has experience in every step of the modeling process, including field data analysis, development and implementation of the computational model, and interpretation and presentation of simulation results.

Ben Martin, P.E. (VA)

Principal Engineer


Mr. Martin is currently a Principal Engineer at Flow Science and has been working with the company since 2005. He performs both CFD and hydraulic transient modeling.  His CFD modeling includes water storage reservoirs and one-dimensional water quality modeling of lakes and reservoirs using DYRESM.  Mr. Martin also has experience using U.S. EPA PLUMES and the three-dimensional ELCOM/CAEDYM models to evaluate mixing and dilution.  His hydraulic modeling includes analysis of gravity flow and pressurized pipeline systems subject to pressure surges and waterhammer caused by pump power failure, pump startup/shutdown, control valve operation, and pipeline ruptures, plus sizing of appropriate surge control appurtenances.