Pete Walker is Professor of Innovative Construction Materials and Director of the BRE Centre of Innovative Construction Materials at the University of Bath, UK. A Chartered Civil and Structural Engineer, Pete has been doing research on construction materials and technologies for over 30 years. His particular interests are natural materials, including straw bale, earth building and natural fibre composites. He has published over 180 articles. He teaches on undergraduate and postgraduate programmes in the joint Department of Architecture & Civil Engineering at the University of Bath. He was the inaugural chair of Earth Building, UK (the national earth association for earth building).