John Patrick O'Brien (February 1 1873 – September 21 1951) was an Irish-American politician who served as the 98th Mayor of New York City from January 1 to December 31 1933. 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?
Answer:
Office Holder