Answer the following question: Anthony Allen Tony Williams (born July 28 1951) is an American politician who served as the fifth mayor of the District of Columbia for two terms from 1999 to 2007. He had previously served as chief financial officer for the District managing to balance the budget and achieve a surplus within two years of appointment. He held a variety of executive posts in cities and states around the country prior to his service in the D.C. government. 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