1. Sr. Sci., Appl. Res. Associates, Raleigh, NC 27609
2. Assoc. Prof. of Civ. Engrg., Univ. of Waterloo, Waterloo, Ontario, Canada N2L‐3G1
3. Pres., Turkstra Lumber Ltd., Stoney Creek, Ontario, Canada
4. Prof. of Civ. Engrg., Princeton Univ., Princeton, NJ