Leon Henry Vaessen (born 8 November 1940) was an English professional association football player of the 1950s and 1960s. He made over 50 appearances in The Football League. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Athlete