Mansfield played for Waterford during the 1960s, however, he enjoyed little success during his inter-county career. During that time he won one Munster medal as a non-playing substitute. Mansfield was an All-Ireland runner-up on one occasion, also as a non-playing substitute.
In retirement from playing Mansfield became involved in coaching and team management. He spent several terms as manager of the Waterford under-21 and senior teams and enjoyed some success.[2] Mansfield also served as a referee at club level.