Andy MacPhail will take over for Pat Gillick as president of the Philadelphia Phillies after this season.
MacPhail, 62, will serve as a special assistant to Gillick for the rest of this season until he takes over the president's role.
Gillick, 77, helped choose MacPhail as his successor.
"He's an information-gatherer and that's very important because any information is critical to making the right decisions," Gillick said of MacPhail.
Gillick stepped down as general manager after the 2008 season and served as an adviser before replacing David Montgomery as president in August 2014.