Jeff Baker's journey in Major League Baseball began when he was drafted by the Colorado Rockies in the fourth round of the 2002 MLB Draft. A right-handed batter known for his ability to play multiple infield and outfield positions, Baker made his MLB debut with the Rockies on April 4, 2005. Over the next few years, he established himself as a reliable utility player, providing depth and flexibility to the team's roster.

Baker's tenure with the Rockies lasted until 2009, during which he demonstrated his capability to contribute both offensively and defensively. In 2008, he had one of his most productive seasons, achieving a batting average of .268 with 12 home runs and 48 RBIs. His performance helped the Rockies reach the postseason, although they were ultimately eliminated in the National League Division Series.

In July 2009, Baker was traded to the Chicago Cubs, where he continued to serve as a valuable utility player. His time with the Cubs saw him playing various positions, including first base, second base, third base, and the outfield. Baker's adaptability made him a useful asset for the Cubs, and he remained with the team until 2012.

Following his stint with the Cubs, Baker's career included brief periods with several other MLB teams. In 2012, he was traded to the Detroit Tigers, where he played a short spell before being acquired by the Atlanta Braves later that year. His time with the Braves was also brief, but he managed to contribute to the team's efforts during the regular season.

In 2013, Baker signed with the Texas Rangers, where he enjoyed a resurgence in his offensive performance. That season, he posted a career-high batting average of .279 and hit 11 home runs, showcasing his ability to deliver at the plate. His performance with the Rangers highlighted his knack for hitting against left-handed pitching, making him a valuable platoon player.

Baker's final MLB stop was with the Miami Marlins, where he played during the 2014 and 2015 seasons. While his playing time decreased, he continued to provide veteran leadership and experience to the Marlins' clubhouse. Over his career, Baker accumulated a batting average of .264, with 54 home runs and 235 RBIs.

Throughout his decade-long career in Major League Baseball, Jeff Baker was known for his adaptability and ability to fill various roles on the field.