High Quality Content by WIKIPEDIA articles! Michael Ray "Mike" Jackson (born December 22, 1964) is a former professional baseball player whose career spanned 19 seasons, 16 of which were spent in Major League Baseball (MLB). Jackson, a relief pitcher for the majority of his career, compiled a career earned run average (ERA) of 3.42, allowing 451 earned runs off of 983 hits, 127 home runs, and 464 walks while recording 1,006 strikeouts over 1,005 games pitched.