Simon lives in the constituency with his wife and three daughters who attend a local school.
Simon was born in Cardiff in 1969 where he attended local state schools and then read Modern History at Oxford University; the first of his family to do so.
Simon began his elected political career as a District Councillor serving Hailey, Minster Lovell & Leafield on West Oxfordshire District Council from 2004-2015. He also served as the County Councillor for Bampton & West Witney and was a Parish Councillor in Leafield.
In 2015 he was elected as the Member of Parliament for North Dorset, a position he was re-elected to in 2017, 2019 and 2024. He has served as the Parliamentary Private Secretary to the Farming Minister, Education Secretary and Home Secretary. He resigned his Home Office position in 2019 in order to stand for the Chairmanship of the Northern Ireland Affairs Select Committee of the House of Commons. He was elected to that post and re-elected in 2019.
He served as Parliamentary Under Secretary of State at the Department for Levelling Up, Housing and Communities as Minister for Local Government from November 2023 - July 2024.
Since being elected to the role in September 2024, Simon has Chaired the Public Administration and Constitutional Affairs Select Committee.