Professor, Christian Medical College, Vellore

Professor new sanitation, Wageningen University

INSTITUTO DE INGENIERIA, UNIVERSIDAD NACIONAL AUTONOMA DE MEXICO

Professor of Environmental Health, Emory University

Northumbria University Newcastle, United Kingdom

Professor, University of North Carolina at Chapel Hill & University of Manchester

Eawag/Sandec, Switzerland & Swedish University of Agricultural Sciences (SLU)

Professor, Civil & Environmental Engineering, University of South Florida

Professor of Civil and Environmental Engineering

Professor of Sanitary Engineering @ IHE Delft and TU Delft