Yonggen Zhang is a Ph.D student in China University of Geosciences since 2008, and a visiting student in Department of Hydrology and Water Resources at the University of Arizona since February 2012, where he is working with Professor Shlomo P. Neuman and Professor Marcel G. Schaap. His main research interests include inverse modeling of vadose zone and groundwater, soil pedotransfer functions to estimate soil hydraulic properties, geostatistical methods for spatial analyses of hydrologic data, and modeling of organic pollution in water, soil and sediment. He is determined to become a professional soil scientist and hydrogeologist who helps tackle some most challenging geosystem problems in the world.