Zhen-Gang (Jeff) Ji, PHD, DES, PE, has more than twenty years of professional experience in surface water modeling and model development. His expertise includes hydrodynamics, wave simulation, eutrophication, toxic process, and sediment transport. He has developed and applied state-of-the-art hydrodynamic models and water quality models to the simulation of rivers, lakes, estuaries, and coastal waters. Currently, Dr. Ji is an oceanographer and numerical modeler with the Minerals Management Service.