1. Assoc. Prof. of Civ. Engrg. and Assoc. Research Engr., Inst. of Transp. and Traffic Engrg., Univ. of California, Berkeley, Calif.
2. Soil Engr., Kaiser Engineers and Constructors, Inc., Akosombo, Ghana; formerly, Research Asst. in Soil Mechanics, Univ. of California, Berkeley, Calif.
3. Asst. Prof. of Civ. Engrg., Univ. of British Columbia, Vancouver, Canada; formerly, Asst. Specialist, Dept. of Civ. Engrg., Univ. of California, Berkeley, Calif.