Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Peter Joslin -  Peter Joslin QPM DL (born 26 October 1933) is a former British police officer and Deputy Lieutenant of Warwickshire. He served as Chief Constable of Warwickshire Police where he held the position for fifteen years from 1983 to 1998 becoming the county's longest serving police chief. In addition at the time of his retirement in 1998 he was also one of the United Kingdom's longest serving police officers having served for 44 years.
A:
Office Holder