About
Peter Mandelson, Baron Mandelson, is a British former Labour Party politician, lobbyist, and diplomat. He served as a Member of Parliament for Hartlepool from 1992 to 2004. During his time in government, he held several high-profile cabinet positions under Prime Ministers Tony Blair and Gordon Brown, including Minister without Portfolio, Secretary of State for Northern Ireland, and Business Secretary. Most recently, he served as the British Ambassador to the United States in 2025.
Career Timeline
Elected to Parliament
Elected as Member of Parliament for Hartlepool.
Minister Without Portfolio
Appointed as Minister without Portfolio in Blair's government.
Resignation and Comeback
Resigns but makes a political comeback.
Northern Ireland Secretary
Appointed as Secretary of State for Northern Ireland.
Business Secretary Appointment
Appointed as Business Secretary under Gordon Brown.
Life Peerage and Lord Mandelson
Elevated to the House of Lords as Baron Mandelson.
Consultancy and Advisory Roles
Moves into consulting and advisory roles post-government.
Ambassador to United States
Appointed as the British Ambassador to the United States.
Continued Diplomatic Influence
Continues serving as ambassador, influential globally.
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Last updated: February 25, 2026