Organization Leeds University

Bloomsbury Group

Durham University

Oxford University

Hull University

University of Sussex

Dartington Hall

Southampton University (head of department | history | 1964)

Royal Navy

University of Nottingham

City University London

University College London

North London Polytechnic

Queen's University, Belfast

Polish Air Force (instructor | WWII)

British Broadcasting Corporation (French broadcasts | WWII)

British Army (WWII)

University College of Wales, Aberystwyth (teacher)

Oxford University (Balliol College | tutorial fellow | 1962 | Worcester College | Professor of Modern History | 1973)

Collège de France (occasional lecturer)

Leicester University (lecturer | fifteen years | professor | head of department | dean | visiting professor of medieval literature)

Stanford University (Robert Bowman Denning Professor of the Humanities | Professor of English | Courtesy Professor of German Studies | Bass Fellow in Undergraduate Education)

Florida State University

Society of Antiquaries (fellow)

English Association (honorary fellow | chair | president | 2000-2005)

Royal Historical Society (fellow)

Learned Society of Wales (fellow | 2020)

Oxford University (St. Anthony's)

British Embassy, Moscow

British Foreign Office

University of Cambridge

University of Ceylon

Gray's Inn

London School of Economics

Trinity Hall, Cambridge

University of Virginia

Durham University

University of Newcastle

St Catharine's College, Cambridge (fellow | chair of Spanish | 1975)

Association of Hispanics of Great Britain and Ireland (president | 1977-1979)

Modern Language Review (general editor | Hispanic editor)

University College London

Cambridge University

Leo Baeck College

Oxford Internet Institute

Scolar Press (founder | 1966)

Anglo-American Eighteenth Century Short Title Catalogue (ESTC | editor-in-chief)

British Library (consultant | 1977)

London University (chair in library and archive studies | 1990)

Guernsey Society

Rugby School

Furniture History Society (principal founder | 1964 | secretary | 1964-1981)

Westfield College, University of London (assistant lecturer in history | 1966-1972 | reader in history | 1972-1995)

Lincoln College, Oxford

Utopian Studies Society

Societe P-J Proudhon

Societe d'etudes Kantiennes En Langue Francaise

Friends Historical Society, London (journal joint editor)

BBC World Services

Institute of Translation and Interpreting (ITI), full member