Professor O'Hara is primarily interested in British central governments' economic and social policies, focusing especially on the period since the First World War, and has written and edited a number of books on this subject. In 2012 he published another full-length monograph on this theme, entitled Governing Post-War Britain: The Paradoxes of Progress
(2012), and he has just published The Politics of Water in Post-War Britain
(2017). He writes regularly on current affairs for a range of periodicals and blogs. Professor O'Hara can be followed on Twitter as @gsoh31
, and he blogs in a personal capacity at the website 'Public Policy and the Past'