November 2019 onwards
Adjunct Professor, Centre of Excellence for Research on Clean Air (CERCA), Indian Institute of Technology-Delhi, Delhi, India
August 2018 onwards
Higher Administrative Grade Professor (HAG) Professor, Civil Engineering, IIT-Kanpur, Kanpur, India
June 2018 – May 2021
Head Department of Civil Engineering, IIT-Kanpur, Kanpur, India
Visiting Professor, School of Civil Environmental Engineering, Georgia Institute of Technology, USA
Nov 2014-Oct 2017
Coordinator Centre for Environmental Science & Engneering, IIT Kanpur
Nov 2014 -Oct 2016
Adjunct Professor Department of Earth Sciences, IIT Kanpur
Visiting Professor School of Civil and Environmental Engineering, Georgia Institute of Technology, USA
May – July 2012
Professor Laboratoire de Physique et Chimie de Environnement, University of Orleans, France.
April 2012 – July 2018
Professor Department of Civil Engineering, IIT Kanpur
Aug 2009 – July 2010
Senior Fellow, NASA Goddard Space Flight Center, Greenbelt, US.
Jan 2008 – Feb 2012
Associate Professor Department of Civil Engineering, IIT Kanpur
May – July 2006
Visiting Associate Professor Centre for Climate System Research The University of Tokyo, Japan
Visiting Researcher NOAA Aeronomy Laboratory, Boulder, USA
July 2003 – Dec 2007
Assistant Professor Department of Civil Engineering and Environmental Engineering and Management Programme Indian Institute of Technology, Kanpur.
Jan 2002 – July 2003
Post-Doctoral Research Assistant, Atmospheric, Oceanic and Planetary Physics, Department of Physics, University of Oxford, UK.
Dec 2000-Dec 2001
Visiting Scientist, Environmental Assessment Division, Bhabha Atomic Research Centre, Mumbai, India.