Joanne L. Wegner is a Professor of Mechanical Engineering at the University of Victoria, Canada. Her research interests include wave propation in elastic and viscoelastic materials with applications to the dynamic behavior of polymers and elastomeric materials and earthquake engineering. Professor Wegner has been recognized for her outstanding contributions to the engineering profession by the Canadian Society of Mechanical Engineers. In addition to her archival publications, she has co-edited two books on nonlinear waves in solids. Professor James Haddow practises research in theoretical and experimental continuum mechanics, thermodynamics, and nonlinear elasticity. The applications of his work are to biomedical materials and metal forming processes.