Please answer the following question: John Herron (Pittsburgh) - John Herron served as Mayor of Pittsburgh from 1849 to 1850. He was the son of Dr. Francis Herron the well-known Presbyterian Minister. The Herrons were among the founding families of Pittsburgh. He captained the Duquesne Grays in the Mexican War during the Siege of Veracruz. His war feats greatly enhanced his electability and President Zachary Taylor visited the city during Mayor Herron's term. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
Answer:
Office Holder