Michael Barnes is the Mayor Pro Tempore of Charlotte North Carolina. He also served as acting Mayor for a short time following the resignation of former mayor Patrick Cannon who was arrested on March 26 2014 for corruption charges. Barnes immediately became acting mayor upon Cannon's resignation. The City Council was then required to appoint a mayor to serve out the remainder of Cannon's term (through Dec. 2015). 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