George A. Ekama is Full Professor at University of Cape Town, South Africa. He has 35 years research experience into activated sludge systems at the University of Cape Town. Over the years he has been at the forefront of developments in BNR activated sludge systems modelling, filamentous bulking, secondary settling tank design and modelling. He has published over 150 research papers on these subjects and he and his research group have been co-authors of 4 of the International Water Association (IWA) Scientific and Technical Reports (STR) on activated sludge modelling, community analysis and secondary settling tanks. He has been visiting Professor at Virginia Tech, University of Padua and the UNESCO- IHE in Delft, teaching graduate courses on wastewater treatment.