1. Prof. of Civ. Engrg., Fritz Engrg. Lab., Lehigh Univ., Bethlehem, Pa.
2. Prof. and Chmn., Civ. Engrg. Dept., Washington Univ., St. Louis, Mo.
3. Prof. of Civ. Engrg., Univ. of Alberta, Edmonton, Canada
4. sr. Engrg. Analyst, Sargent and Lundy, Chicago, Ill.