Greg Jefferies had a 14-year career from 1987 to 2000. He was a highly touted prospect who became the first two-time winner of the Baseball America Minor League Player of the Year Award. He went on to become a two-time All-Star. Greg Jefferies has hand signed this RONL Rawlings Official National League Baseball (Bart Giamatti President). Certificate of Authenticity from Athlon Sports Collectibles.