1. Asst. Prof. of Geotechnical Engrg.; Macka Civ. Engrg. School, Istanbul Technical Univ., Istanbul, Turkey; formerly, Post-doctoral Research Fellow, Dept. of Civ. Engrg., Northwestern Univ., Evanston, Ill
2. Prof. of Civ. Engrg.; Northwestern Univ., Evanston, Ill