My research is centred on understanding the dynamics of defects in crystals, particularly those in structural materials for extreme environments such as next-generation fission and fusion reactors. I develop mathematical and computational models for materials at the mesoscale, i.e. lengthscales of the order of 100s of nanometres to 100s of microns. These models aim to bridge the gap between the smaller realms of atomistic and electronic calculations with the larger scales of engineering interest.