From 2003 to 2009, Ferriter hosted What If, a Sunday morning radio programme on RTÉ 1 and presented RTE's The History Show from 2011 to 2012.
[5] His 2007 biography of Éamon de Valera, Judging Dev, won in three categories of the 2008 Irish Book Awards.
He has also served on the Board of the National Library of Ireland and as a member of the Irish Archives Advisory Council.
[6] In 2013, he publicly supported the political campaign Democracy Matters, which opposed proposals to abolish the Irish Senate.
He was also centrally involved in the campaign to retain history as a core subject on the Irish Junior Certificate curriculum.