The Brewers have selected Peterson to help turn around a starting rotation that ranked last in the National League with a 5.37 earned run average in 2009, a performance that ruined the team's chances of returning to the playoffs. He is expected to be formally introduced Tuesday by the club.
Peterson, who will be 55 at the end of the month, has links to both Macha and Randolph. Peterson worked in Boston's farm system with Macha and also served as his pitching coach with the Oakland Athletics in 2003.
Peterson then moved on to become pitching coach of the New York Mets, where Randolph was the manager. The two worked together there until they were dismissed during the 2008 season.