1. Postdoc Research Associate, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA.
2. Professor and Director, Dept. of Civil, Construction, and Environmental Engineering and Program for Sustainable Pavement Engineering and Research, Iowa State Univ., Ames, IA.
3. Associate Director, Program for Sustainable Pavement Engineering and Research, Institute for Transportation, Iowa State Univ., Ames, IA.
4. Civil Engineer, Federal Aviation Administration, Airport Pavement R&D Section, William J. Hughes Technical Center, NJ.