Simon Hart was MP for Carmarthen West and South Pembrokeshire between 2010 and 2024. Previously a chartered surveyor, Simon cut his political teeth as the former chief executive officer of the Countryside Alliance, the UK's largest rural lobbying group, between 2003 and 2010. He served on four select committees and then, following Theresa May's election as prime minister in 2016, became her representative on the Committee for Standards in Public Life. He was appointed as Minister for Implementation in the Cabinet Office under Boris Johnson, and then joined the Cabinet as Secretary of State for Wales. He later resigned from his government the day before Johnson himself surrendered. In October 2022, Rishi Sunak invited him to become Chief Whip, where he became one of the few chief whips to last an entire premiership. He is married with two adult children, and lives in Pembrokeshire.