[4] He played soccer for the Penn Quakers, earning All-Ivy League honors.
[7] Kempf played in four games for the Philadelphia Fury of the North American Soccer League (NASL) in 1978 as a midfielder and recorded 274 minutes.
[9] He then played in four games for the Pennsylvania Stoners of the American Soccer League (ASL) in 1979 and made one goal.
[11] He played in nine games for the Oilers that season, converting four of six field goals and 16 of 18 extra points.
[12] Kempf played in nine games in 1984, making four of six field goals and 14 of 14 extra points, before being placed on injured reserve on November 24, 1984.
[11] Kempf then signed with the New Orleans Saints in 1987 and played in one game for the team during the players strike, converting four of five field goals and one of one extra points.