· Senior Research Scientist Emeritus, Discovery Partners Institute2020–2022
· Founder of the Urban Center for Computation and Data (UrbanCCD), University of Chicago2012–
· Chief Information Officer at Argonne National Laboratory (via Argonne), University of Illinois at Urbana-Champaign2007–2010
· Senior Computer Scientist, Argonne National Laboratory
· CTO, National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign
· Visiting Senior Fellow at the Mansueto Institute for Urban Innovation, University of Chicago
· Senior Computer Scientist, U.S. Department of Energy’s Argonne National Laboratory