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- A Liberal Democrat member of the House of Lords since 1996. Currently a member of the Select Committee of the House on International Relations and Defence. A past Deputy Chairman of Committees, and a member of the COVID Committee of the House. Formerly Convenor of the Liberal Democrats in the House of Lords
- Senior Research Fellow, Harris Manchester College, University of Oxford https://hmc.ox.ac.uk/
Honorary Fellow, Pembroke College, University of Oxford https://www.pmb.ox.ac.uk/
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- Director, Conference on the Resolution of Intractable Conflict (CRIC), Oxford http://cric-oxford.org/
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- Executive Chairman and Director, Changing Character of War Centre and CCW Academic Board, Pembroke College, University of Oxford The Changing Character of War Centre (ccw.ox.ac.uk)
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- Research Affiliate, School of Anthropology and Museum Ethnography, University of Oxford
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- Research Associate, Department of Politics and International Relations, University of Oxford
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- President, ARTIS (Europe) Ltd (research, teaching and intervention support, especially in the psychology of terrorism, political violence and other major psychosocial phenomena) https://www.artiseurope.com
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- Founding Chairman, The Concord Foundation (Ireland) CLG.
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- Chairman Emeritus, Centre for Democracy and Peace Building (formerly the Founding Chairman and a Director) https://democracyandpeace.org
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- Director and Vice President, International Dialogue Initiative (USA) https://www.internationaldialogueinitiative.com/
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- President, Peru Support Group – https://perusupportgroup.org.uk
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- Trustee and Chairman of the Board of Trustees, National Liberal Club https://nlc.org.uk/
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- Professor of Practice, Global Humanity for Peace Institute, University of Wales Trinity St David
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- Chairman of the Advisory Board of MENA 2050, a not-for-profit UK company working on social and economic cooperation in the Middle East and North Africa (from July 2023)
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- A director of the Forum de Victoria/Victoria Forum – a not-for-profit Canadian company working on national and international dialogue for peace, stability and reconciliation (from Aug 2023)
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- Retired NHS Consultant Psychiatrist and Senior Lecturer at The Queen’s University of Belfast and previously a Clinical Professor in the Department of Psychiatry, University of Maryland, Baltimore (USA)
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- President, Westminster Pastoral Foundation
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- Trustee, Methuen Trust, Corsham
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- Trustee, Liberal Party Supplementary Pension Fund