DR. JOSEPH SCHWAIGHOFER studied Civil Engineering and Engineering Mechanics at the T. H. Graz and the Pennsylvania State University where he also was a student of Dr. Joseph Marin. In 1960 he held a research fellowship of the French government at the University of Nancy and from 1965 to 1966 he was a Visiting Associate Professor at North Carolina State University. Professor Schwaighofer is a consultant in model analysis to several structural firms and has conducted research in Solid State Mechanics and Photoelasticity. At present he is Associate Professor in the Department of Civil Engineering at the University of Toronto.