1. Brown and Root Prof. of Engrg. and Chmn., Dept. of Civ. Engrg., Rice Univ., Houston, TX
2. Prof. of Civ. Engrg., Rice Univ., Houston, TX
3. Prof. and Coordinator of Grad. Studies, Dept. of Civ. Engrg., Catholic Univ. of Rio de Janeiro, Brazil
4. Formerly, Graduate Student, Dept. of Civ. Engrg., Rice Univ., Houston, TX