2022 The World Made by Women: A History of Women from the Apple to the Pill (Penguin/Random House)
2015 ‘Lincoln’s Emancipation Proclamation: A Propaganda Tool for the Enemy?’ in Exploring Lincoln: Great Historians Reappraise Our Greatest President, eds. Harold Holzer, Craig L. Symonds, and Frank J. Williams (Oxford University Press)
2014 ‘Coda: A Rountable on Memory’ in The Civil War as Global Conflict: Transnational Meanings of the American Civil War eds. David T. Gleeson and Simon Lewis (University of South Carolina Press)
2014 ‘Greenwich Village’ in Greenwich Village Stories: A Collection of Memories, ed. by Judith Stonehill (Universe)
2013 ‘How to Lose Allies and Alienate People’ in The New York Times’ Disunion: Modern Historians Revisit and Reconsider the Civil War from Lincoln’s Election to the Emancipation Proclamation, ed. Ted Widmer (Black Dog & Leventhal)
2013 ‘Lincoln’s Emancipation Proclamation: A Propaganda Tool for the Enemy?’ in Reconfiguring the Union: Civil War Transformations, eds. Iwan W. Morgan and Philip John Davies (Palgrave Macmillan)
2013 ‘Hyde Park’ in City Parks: Public Places, Private Thoughts, ed. Catie Marron (HarperCollins)
2010/11 A World on Fire (Penguin UK, Random House US)
2008 Introduction to George IV, Christopher Hibbert (Palgrave Macmillan)
2004 ‘What if Britain and the United States had gone to war in 1861’ in What Might have Been, ed. Andrew Roberts (Weidenfeld)
2004 Series editor with Professor Lisa Jardine, ‘Making History’, (HarperCollins world-wide)
2002 New Dictionary of National Biography (Oxford University Press), Multiple entries.
2001 Introduction to Madame de Pompadour, Nancy Mitford (New York Review of Books)
2001 Introduction to The Sylph, Georgiana, Duchess of Devonshire (Henry Parker UK)
1998 Georgiana, Duchess of Devonshire (HarperCollins UK, Random House US, 2000)
1997 ‘A Politician’s Politician’ in Gender in Eighteenth Century England: Roles, Representations and Responsibilities, eds. Elaine Chalus and Hannah Barker (Longmans UK)
Television and Radio Documentaries:
2019 Contributor and Associate Producer, ITV: Victoria’s Palace
2017 Series Consultant, Contributor, NatGeo: Origins
2015 Writer, presenter, BBC 2: The Ascent of Woman
2014 Writer, presenter, BBC Radio 4: The Georgians
2011 Contributor, Channel 5: ‘Code Plan Red’
Contributor, BBC Radio 4: The Prime Ministers: Series 2: 2. Earl Grey
Writer, presenter, BBC Radio 3: What is History?: Episode 3
Writer, presenter, BBC 2: This Week, 27 May
Writer, presenter, BBC 2: This Week, 8 November
2002 Contributor, BBC 2 Reputations: ‘Marie Antoinette’
Writer, presenter, Channel 4 Television: ‘The Duke of Wellington and his Women’
2001 Writer, presenter BBC Radio 4: ‘Queen Victoria’
1999 Presenter and Writer, BBC Television, Newsnight: ‘The Abolition of the House of Lords: What the Future Holds’
Consultant, Channel Four: ‘The Peoples’ Duchess: Georgiana, Duchess of Devonshire’
1998 Writer, presenter, BBC Radio 4: ‘The History of the Temperance Movement’
Awards:
2012 Fletcher Pratt Award for excellence in Civil War history writing.
1999 Whitbread Prize for Best Biography
1993 Henrietta Jex-Blake Senior Fellowship, Lady Margaret Hall, Oxford