1. Research Engr., Laboratorium H. Hossdorf, Basel, Switzerland; formerly, Grad. Student, Dept. of Civ. Engrg., Princeton Univ., Princeton, N.J.
2. Asst. Prof. of Struct. Engrg., Cornell Univ., Ithaca, N.Y.; formerly, Lect. in Architecture and Civ. Engrg., Princeton, Univ., Princeton, N.J.
3. Prof. of Civ. Engrg., Princeton Univ., Princeton, N.J.