1. Postdoctoral Research Fellow, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin.
2. Priddy Centennial Professor, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas at Austin.
3. Postdoctoral Research Fellow, Dept. of Civil and Environmental Engineering, Pontifical Catholic Univ. of Rio de Janeiro, Rio de Janeiro, Brazil.