Chemist. University College of Wales, Aberystwyth, 1894-1895; Merton College, Oxford, 1896-1898; private research in Oxford, 1898-1899; Demonstrator, McGill University, Montreal and work with Rutherford on Atomic Disintegration Theory, 1900-1903; University College, London, work with Ramsay and lecture tour to Australia, 1903-1904; Lecturer in Physical Chemistry, Glasgow University, 1904-1914; Fellow of the Royal Society, 1910; Professor of Chemistry, Aberdeen University, 1914-1919; Dr. Lee's Professor of Chemistry, Oxford, 1919-1936; Nobel Laureate in Chemistry, 1921.