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. Jeffrey L. Viken -  Jeffrey Lynn Viken (born 1952) is the Chief Judge of the United States District Court for the District of South Dakota. He previously was the federal public defender for North Dakota and South Dakota.
A:
Office Holder