1. Assoc. Prof. of Civ. Engrg., Massachusetts Inst. of Tech., Cambridge, Mass
2. Supervising Geotechnical Engr., Brian Watt Assocs., Inc., Houston, Texas; formerly Research Asst. in Civ. Engrg., Massac husetts Inst. of Tech., Cambridge, Mass
3. Research Asst. in Civ. Engrg., Massachusetts Inst. of Tech., Cambridge, Mass