1. Visiting Prof. of Civ. Engrg., Swiss Federal Inst. of Tech., Lausanne, Switzerland; formerly Asst. Prof. of Civ. Engrg. (Visiting), Massachusetts Inst. of Tech., Cambridge, Mass.
2. Principal, Geotechnical Engrs., Inc., Winchester, Mass.; formerly Assoc. Prof. of Civ. Engrg., Massachusetts Inst. of Tech., Cambridge, Mass.