1. Assoc. Prof., Dept. of Civ. Engrg., Carnegie-Mellon Univ., Pittsburgh, Pa.; formerly, Assoc. Prof. of Civ. and Mineral Engrg., Univ. of Minnesota, Minneapolis, Minn.
2. Asst. Prof., Dept. of Civ. Engrg., Tri-State Coll., Angola, Ind.; formerly, Teaching Assoc., Dept. of Civ. and Mineral Engrg., Univ. of Minnesota, Minneapolis, Minn.
3. Assoc. Prof., Dept. of Civ. and Mineral Engrg., Univ. of Minnesota, Minneapolis, Minn.