1. Asst. Prof., Dept. of Civ. Engrg., Univ. of Miami, Coral Gables, Fla.; formerly Research Asst., Dept. of Civ. Engrg., Univ. of Illinois, Urbana, Ill.
2. Prof., Dept. of Civ. Engrg., Univ. of Illinois, Urbana, Ill.
3. Prof., School of Civ. Engrg., Georgia Inst. of Tech., Atlanta, Ga.