Matt's research interests focus on developing and using total scattering techniques for the study of disordered crystalline materials. Highlights include studies of negative thermal expansion, pressure induced amorphization and colossal thermal expansion. He has successfully led the development of a Reverse Monte Carlo program (RMCProfile), specifically designed for the analysis of total scattering data of polycrystalline materials. This program suite is freely available for download (www.rmcprofile.org) and is used by scientists around the world.