Darren Tierney

Darren Christopher Tierney (born 29 January 1975)[1] is a British civil servant, serving since 2023 in the Cabinet Office as the director-general for propriety and constitution group.

[2] Tierney, a Roman Catholic from Northern Ireland who attended St Columb's College in Derry and then Queen's University Belfast,[1] joined the civil service in 2007, joining the Ministry of Justice where he held various roles including as Principal Private Secretary to the Lord Chancellor, Kenneth Clarke.

[2] He then briefly worked for the Cabinet Office as director for civil service efficiency in 2015, returning to the Ministry of Justice as interim director-general of prison policy in 2016 for a few months.

[2][3] Tierney returned to the Cabinet Office in 2021, taking over from outgoing Deputy Cabinet Secretary Helen MacNamara in the part of her role as overseeing propriety and ethics across the UK government.

[2][3] Tierney worked on the investigation into the Westminster Christmas parties controversy with his predecessor but one in this role, Sue Gray.