1. Graduate Research Assistant, School of Education, Iowa State Univ., Ames, IA.
2. Assistant Professor, Dept. of Civil, Construction, and Environmental Engineering, Iowa State Univ., Ames, IA.
3. Associate Professor, Dept. of Community and Regional Planning, Iowa State Univ., Ames, IA.
4. Assistant Professor, School of Education, Iowa State Univ., Ames, IA.