1. Postdoctoral Research Associate, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA. ORCID: .
2. Undergraduate Research Assistant, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA.
3. Professor and Director, Dept. of Civil, Construction, and Environmental Engineering, Program for Sustainable Pavement Engineering and Research, Iowa State Univ., Ames, IA.
4. Research Scientist, Institute for Transportation, Iowa State Univ., Ames, IA.