After his playing days ended, Aker managed in the minor leagues in 1975–85, winning the Governor's Cup (International League Championship) with the 1982 Tidewater Tides (Mets organization), and was the Cleveland Indians pitching coach from late 1985 to 1987.
Following his playing days, Aker played in minor leagues from 1975 to 1985, winning the Governor's Cup (International League Championship) with the Tidewater Tides for the Mets organization. He then worked as the Cleveland Indians pitching coach from late 1985 until 1987.