1. Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Michigan State Univ., East Lansing, MI.
2. Assistant Professor, Dept. of Civil Engineering, Auburn Univ., Auburn, AL.
3. Assistant Professor, Dept. of Civil and Environmental Engineering, Michigan State Univ., East Lansing, MI.
4. Professor, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA.