He was promoted to Professor of Urban History at the University of Leicester in 1973, but it was a personal title; there was no department of urban history. He founded the Urban History Newsletter in 1963. The Newsletter was largely replaced by the Urban History Yearbook from 1974, which later became Urban History. His students included David Reeder; he influenced others, including David Cannadine.
He wrote historiographical essays and occasional case studies, especially on the Victorian slum. His joint essay with Reeder Slums and Suburbs postulated a relationship at the level of flows of capital between the appearance, often rapid, of central urban slums, and the development of the peripheral suburbs of a city.
- Victorian Suburb (1961)
- Exploring the Urban Past: Essays in Urban History edited by David Cannadine and David Reeder (1982)
- *Article on Dyos by Sheridan Gilley, pp. 331-2 in Kelly Boyd (editor), Encyclopedia of Historians and Historical Writing (1999).
- Biographical note, p. 910 of H. J. Dyos, Michael Wolff, The Victorian City: Images and Realities (1999).
- H. J. Dyos, "The Slums of Victorian London," Victorian Studies, Vol. 11, No. 1 (Sep., 1967), pp. 5-40.
- H. J. Dyos and D. A. Reeder, Slums and Suburbs, pp. 356-386 in H.J. Dyos and M. Wolff (editors), The Victorian City: images and realities vol. 1 (1973).
- Richard Rodger, The Transformation of Edinburgh: Land, Property and Trust in the Nineteenth Century (2004), p. 452.
- Seymour J. Mandelbaum, "H. J. Dyos and British Urban History," The Economic History Review (1985) Volume 38 Issue 3, pp. 437–447, DOI: 10.1111/j.1468-0289.1985.tb00383.x in JSTOR