1. Senior Research Engr., Franklin Inst. Research Labs., Philadelphia, Pa.; formerly Graduate Student, Graduate School of Arts and Sciences, Univ. of Pennsylvania, Philadelphia, Pa.
2. Prof. and Chmn., Towne Sch. of Civ. and Mech. Engrg., Graduate Div. of Civ. Engrg., Univ. of Pennsylvania, Philadelphia, Pa.