McMahon moved on to coaching while still an active player with the San Francisco Giants in the early-70s before retiring as an active player for good after the 1974 season at the age of 44.
A couple of years later he was sharing his wisdom with the Minnesota Twins pitching staff, sharing what he himself picked up as a Big League pitcher for 18 seasons between 1957 and 1974.
Considering that McMahon was already 27 years of age when he debuted in 1957 with the Milwaukee Braves, it’s amazing he even threw for 18 years.
By the time he retired, he appeared in 874 games, and except for two starts for the Houston Colt .45’s in 1963, all others were out of the bullpen, establishing himself as a relief specialist on his way to 152 saves and 505 games finished, with a very nice 2.96 earned run average playing for seven organizations.
A product of the famous Erasmus High School in Flatbush Brooklyn, he’d finish his career with a record of 98-68 while also winning two championships, 1957 with the Braves and 1968 while with the Detroit Tigers.