Ian Philip Grant, DPhil; FRS; CMath; FIMA, FRAS, FInstP [1] (born 15 December 1930) is a British mathematical physicist.
[2] He is a pioneer in the field of computational physics and is internationally recognised as the principal author of GRASP, the General Relativistic Atomic Structure Program.
[2] He has also been instrumental in the creation of computer codes[6] that are used worldwide (in particular GRASP)[7][3][8][9] and have had a major impact on the understanding of both the foundations of the relativistic theory of many electron systems and on the precision of theoretical interpretation of a variety of properties of atoms.
[4] Professor Grant and his co-workers extended this approach to the relativistic modelling of molecular electronic structure and the development of the BERTHA computer package.
[10] Further research work included studies of electron scattering from heavy atoms and of the structures of molecules containing heavy atoms, culminating in the creation of the DARC computer package, integrating modules designed for calculations using relativistic R-matrix approach and GRASP.