 In October 1905, Mawer was appointed Lecturer in English at the University of Sheffield.A few weeks later, after having his thesis on this subject examined by experts, Mawer was elected to a fellowship by Gonville and Caius College, which he held until 1911.In 1908 he was elected to the Joseph Cowen Professorship of Language and Literature in Armstrong College, Newcastle, where he would remain for thirteen years.