In 1963 Holmes was appointed to an assistant lectureship at the University of Sheffield in the Department of Economic and Social History under Sidney Pollard, then a rising star in the field of Economic History. During the 1970s the two worked closely together producing several volumes of documents covering European Economic History in the modern period. These books were: The Process of Industrialization (1968); Industrial Power and National Rivalry (1972) and The End of the Old Europe (1973). Holmes and Pollard also edited Essays in the Economic and Social History of South Yorkshire (1977 reprinted 1979). Together with Alan Booth, in 1991 Holmes edited and contributed to a "festschrift" for Pollard called Economy and Society. European Industrialisation and its Social Consequences. On Pollard's death in 1988 Holmes became his literary executor and also edited for publication Pollard's Essays on the Industrial Revolution in Britain (2000).
Areas of Research / Professional Expertise
In 1998 he wrote "John Bull's Island: Immigration & British Society, 1871–1971", which is widely regarded as an authoritative text on the history of migration. It focused on a wide range of groups that entered Britain in these years, their contributions to society and the varied responses they encountered. A similar but smaller study, "A Tolerant Country? Immigrants, Refugees and Minorities in Britain", appeared in 1991. Holmes's interest in migrant groups was also evident in his contribution, "The Chinese Connection" which appeared in Outsiders and Outcasts. Essays in honour of William J Fishman (1983) which he edited jointly with Geoffrey Alderman, and his two volumes of edited source material in Migration in European History.
Following his appointment as assistant lecturer Holmes later became lecturer (1965), senior lecturer (1972) and reader (1980) before being appointed to a personal professorship in the Department of History in 1989. He retired in 1998 and is now an Emeritus Professor of History in the University. During his career Holmes supervised a large number of postgraduate students, some of whom have subsequently been appointed to Chairs in British Universities, and who are often referred to as the "Sheffield School" (see Welsh History Review, June 1990. vol. 50. no. 1. p. 138). Following his retirement, in 2002 he held a Parkes Fellowship at the University of Southampton.
Holmes continues with his research interests. He contributed on British Government Policy Towards War Time Refugees in M. Conway and J Gotovitch Europe in Exile. European Exile Communities in Britain, 1940–1945 (2001). In 2008 The Burton Book co-written by Geoffrey Alderman appeared in the Journal of the Royal Asiatic Society. In 2015 his chapter William Joyce and the German Connection will come out in Ian Wallace (ed.) Voices from Exile. Much of his time recently has been consumed by working on his long-awaited political biography of William Joyce: Searching for Lord Haw-Haw: The Political Lives of William Joyce was published by Routledge in August 2016.