- Bats Right, Throws Right
- Height 6' 2", Weight 200 lb.
- High School Overbrook High School (Philadelphia)
- Debut September 2, 1977
- Final Game October 3, 1990
- Born September 22, 1955 in Philadelphia, PA USA
His nickname was "Prison Face" until 1987. After he asked to be called Jeffrey instead of Jeff, his teammates changed his nickname to "Penitentiary Face."
- 1978 Player of the Year Pacific Coast League Albuquerque Dukes
- 1979 Topps All-Star Rookie Team
- 2-time All-Star (1987 & 1989)
- 1987 NLCS MVP
- 20-Home Run Seasons: 3 (1983, 1984 & 1989)
Year-By-Year Minor League Managerial Record
|1997||Modesto Athletics||California League||74-67||4th||Oakland Athletics|
|1998||Huntsville Stars||Southern League||72-68||3rd||Oakland Athletics||Lost in 1st round|
|2008||Reno Silver Sox||Golden Baseball League||30-58||8th||Independent Leagues|
- Jeffrey Leonard (as told to George Vass): "The Game I'll Never Forget", Baseball Digest (September 1990), pp. 33-34.