evidence: The University of Oxford began to award doctorates for research in the first third of the 20th century. The first Oxford DPhil in mathematics was awarded in 1921.[59] The list of distinguished scholars at the University of Oxford is long and includes many who have made major contributions to politics, the sciences, medicine, and literature. As of October 2022, 73 Nobel laureates and more than 50 world leaders have been affiliated with the University of Oxford.[22] [...] Oxford was ranked 13th in the world in 2022 by the Nature Index, which measures the largest contributors to papers published in 82 leading journals.[207][208] It is ranked fifth best university worldwide and first in Britain for forming CEOs according to the Professional Ranking World Universities,[209] and first in the UK for the quality of its graduates as chosen by the recruiters of the UK's major companies.[210]