Prof. Dr. Marcelo Zaiat is a Chemical Engineer and Master in Chemical Engineering (Federal University of São Carlos-UFSCar, 1990 and 1992), Doctor in Hydraulics and Sanitary Engineering (University of São Paulo-USP, 1996), with Free-Docency in Biological Wastewater Treatment (USP, 2004). He has been a full professor at the São Carlos School of Engineering (USP) since 1998 in the area of Environmental Engineering and Researcher 1A of the National Council of Technological and Scientific Development (CNPq). His research interests include biohydrogen production from wastewater, bioreactor design, and wastewater treatment with anaerobic reactors as the core technology.