Seán O'Brien is an Irish Gaelic football player. He is viewed as being instrumental to the success of his club, Nemo Rangers.[1] With Nemo, he has won many county championships, munsters, and an All-Ireland Club Final in 2003. He also plays for Cork and in 2006, he was selected as a Waterford Crystal Munster Football All-Star.[2] He started his inter-county career as a defender, but has since become a half forward.