1995, Bachelor's in Chemical Engineering, Indian Institute of Technology; 1999, PhD in Environmental Engineering, University of Connecticut. Associate Professor of Earth and Environmental Engineering, Fu Foundation School of Engineering and Applied Science, Columbia University. Leads the Wastewater Treatment and Climate Change programme and the Columbia University Biomolecular Environmental Sciences programme. Research interests in sustainable sanitation, developing and implementing resource recovery technologies in the developing and developed worlds, with a specific focus on the sustainable management of the global nitrogen cycle. 2008, invited professor, Delft University of Technology, Netherlands. On the Board of Trustees, Water Environment Federation. Recipient of awards: 2010 Paul L. Busch award, Water Environment Research Foundation, for excellence in water quality research; National Science Foundation CAREER award (2009); summer faculty fellowship, National Academies of Science (2007).