This work is a collection of papers on the mechanics of fluids and solids, written by leading researchers. The book encompasses theoretical, experimental and numerical work on a variety of topics, including nonlinear elasticity, plasticity, dynamics, water waves and turbulence. The collection is published in celebration of Professor Paul M. Naghdi's contributions to the field of mechanics. It is intended to be of interest to graduate students and researchers in all branches of continuum mechanics.