1. Postdoctoral Research Associate, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., Ames, IA.
2. James M. Hoover Professor of Geotechnical Engineering, Dept. of Civil, Construction and Environmental Engineering, Iowa State Univ., Ames, IA.
3. University Professor, Dept. of Chemical and Biological Engineering and Dept. of Statistics, Iowa State Univ., Ames, IA.