He was educated at Eton College and Christ Church, Oxford where he was graduated with a degree in history in 1968. In 1967, he served as the President of the Oxford Union. He was called to the Bar in 1968, and has worked as a barrister since. He became a Queen's Counsel in 1990, a year after his sister, Dame Mary Hogg, who is now a judge in the Family Division of the High Court.
Hogg held the seat with a majority of 18,150 and has remained an MP since. His seat at Grantham was abolished, and since the 1997 General Election he has represented Sleaford and North Hykeham.
He became a member of the government of Margaret Thatcher following the 1983 General Election when he was appointed as a whip for a year. He rejoined the government in 1986 when he was appointed as a Parliamentary Under Secretary of State at the Home Office and was promoted in 1989 as the Minister of State at the Department of Trade and Industry.
He was moved in 1990 under the leadership of John Major to the Foreign and Commonwealth Office, becoming a member of the Privy Council in 1992. He joined Major's Cabinet as the Minister of Agriculture, Fisheries and Food in 1995, serving in that capacity during the BSE crisis for which he received much criticism and remaining in post until the election of the Tony Blair government in 1997. Following the 1997 General Election he was a member of the home affairs select committee for a year, and has remained on the backbenches since. The house of Lords Act 1999, which removed the right of hereditary peers to sit in the House of Lords, meant that Viscount Hailsham did not have to disclaim his peerage to remain an MP on the death of his father.