| Professor | Civil and Environmental Engineering and the Princeton Materials Institute | Princeton University | 2021 - Present |
| Adjunct Professor | School of Civil and Environmental Engineering | Georgia Institute of Technology | 2021 - Present |
| Professor | School of Civil and Environmental Engineering | Georgia Institute of Technology | 2015 - 2021 |
| Program Director | Mechanics of Materials | National Science Foundation | 2009 - Present |
| Acting Program Director | Nano and Bio Mechanics | National Science Foundation | 2009 - 2010 |
| Adjunct Professor | Dept. of Civil and Environmental Engineering | University of Illinois at Urbana-Champaign | 2015 - Present |
| Professor | Dept. of Civil and Environmental Engineering | University of Illinois at Urbana-Champaign | 2005 - 2015 |
| Faculty Affiliate | Dept. of Mechanical Science and Engineering | University of Illinois at Urbana-Champaign | 2005 - 2015 |
| Associate Professor | Dept. of Civil and Environmental Engineering | University of Illinois at Urbana-Champaign | 2001 - 2005 |
| Assistant Professor | Dept. of Civil and Environmental Engineering | University of Illinois at Urbana-Champaign | 1998 - 2001 |
| Faculty Fellow | Dept. of Theoretical and Applied Mechanics | University of Illinois at Urbana-Champaign | 2000 - 2015 |
| Faculty | Computational Science and Engineering | University of Illinois at Urbana-Champaign | 2000 - 2015 |
| Fellow | National Center for Supercomputing Application | University of Illinois at Urbana-Champaign | 2002 - 2003 |
| Adjunct Professor | Dept. of Civil and Environmental Engineering | University of California - Davis | 1998 - 2001 |
| Assistant Professor | Dept. of Civil and Environmental Engineering | University of California - Davis | 1995 - 1998 |
| Faculty Fellow | Graduate Group in Applied Mathematics
| University of California - Davis | 1997 - 1998 |
| Consultant | Oak Ridge National Laboratory | Oak Ridge, Tennessee | 1995 - Present |
| Consultant | Dehan Engineering Numerics | Ithaca, New York | 1995 |
