Leonard (b. 1955) played in the majors from 1977 to 1990 for the Dodgers, Astros, Giants, Brewers and Mariners. He had 1,342 hits, 144 home runs and a .266 batting average. He was a two-time All Star (1987 and 1989) and was the 1987 NLCS MVP. His best MVP finish was 20th in 1983; he was second in the 1979 NL Rookie of the Year voting, behind Rick Sutcliffe. Also, baseball-reference has one of his nicknames listed as "Penitentiary Face".
I mailed to Leonard on April 15 and got the card back on July 16, for a 92-day TAT.