1. Dir., Inst. of Urban and Regional Research, Prof., Urban and Regional Planning, and Geography, and Adjunct Prof., Civ. Engrg., Univ. of Iowa, Iowa City, Iowa
2. Research Assoc., Inst. of Urban and Regional Research, and Prof. of Psychology, Univ. of Iowa, Iowa City, Iowa
3. Transportation Planning Coordinator, Oakland County, Mich; formerly, Research Coordinator, Inst. of Urban and Regional Research, Univ. of Iowa, Iowa City, Iowa