| Citation | Professor Payne is responsible for many of the technical developments that have lead to the widespread adoption of the total energy pseudopotential technique. These include the development of robust, efficient minimisation techniques. These have been critical for the ' black box ' implementation of pseudopotential calculations which has allowed non-experts to apply the technique to systems of interest. He has made numerous contribution to the development of optimum, minimal scaling algorithms for the computationally intensive parts of the calculations. Finally, he was responsible for the implementation of codes on parallel computers allowing the first fully optimised quantum mechanical calculations to be performed for systems containing hundreds of atoms. This breakthrough was primarily responsibel for the adoption of density functional theory in chemistry. |