Dr. Sergio E. Serrano has over 25 years of experience as a university professor of hydrology, and over 30 years of international professional experience in hydrologic engineering and modeling. He has been an associate editor of various hydrologic journals; the author of over 100 publications in scientific journals and books in the field of hydrology; and a pioneer of several new solutions of nonlinear equations in surface, subsurface, and contaminant hydrology.