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. Mark Williams (volleyball) -  Mark Williams (born March 27 1979 in Sydney New South Wales) is a Australian-born American beach volleyball player.Williams was born in Australia but moved to the United States when he was nine years old. In 1999 while he was at UCLA Williams trained with the Australian national indoor team.
The answer to this question is:
Athlete