Phil HASNIP is an author of the CASTEP code and a Research Software Engineer Fellow in the Physics Department of the University of York (UK). His particular specialism is in developing and optimising new methods to solve the Kohn-Sham equations efficiently in software, and he has a keen interest in making scientific software as usable, efficient and reliable as possible. Phil's current scientific research interests include using CASTEP to model and design thermoelectric materials, for efficient conversion of waste heat into electricity.