Please answer the following question: Albert Henry Stanley 1st Baron Ashfield PC TD (8 August 1874 – 4 November 1948) born Albert Henry Knattriess was a British-American who was managing director then chairman of the Underground Electric Railways Company of London (UERL) from 1910 to 1933 and chairman of the London Passenger Transport Board (LPTB) from 1933 to 1947.Although born in Britain his early career was in the United States where at a young age he held senior positions in the developing tramway systems of Detroit and New Jersey.  Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Office Holder