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