Career
He made his Major League Baseball (MLB) debut with the Oakland Athletics in 2013. Peterson was traded from the Saint Louis Cardinals to the Oakland Athletics for Matt Holliday on July 24, 2009. He was added to the 40-man roster on November 20, 2012.
He was claimed off waivers by the Chicago Cubs on December 19 and then again by the Milwaukee Brewers on December 23.
The Brewers designated Peterson for assignment on January 29, 2016. He was sent outright to the Colorado Springs Sky Sox, the Brewers American Automobile Association affiliate, on February 4th, 2016.
He was invited to the Brewers" Spring Training camp in mid-February to compete for the lone outfield position still open, and is one of nine players competing to be the Brewers center fielder for the 2016 season.