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. Lyman R. Casey - Lyman Rufus Casey (May 6 1837 January 26 1914) was a United States Senator from North Dakota. Born in York New York he moved with his parents to Ypsilanti Michigan in 1853. He received a classical education and engaged in the hardware business for many years; in 1882 he moved to Carrington Foster County Territory of Dakota and became a rancher.
A:
Office Holder