He was a starter on the 1964 Michigan team that won the Big Ten Conference championship and defeated Oregon State in the 1965 Rose Bowl.

Mack later referred to the position change as "the big break of my life," an opportunity that "turned my whole experience in terms of football around.

"[5] As a junior, he started seven games at right tackle and won the Meyer Morton Award for the 1964 Michigan Wolverines football team that compiled a 9–1 record, outscored opponents 235–83, and defeated Oregon State in the 1965 Rose Bowl.

[1] During his NFL career, Mack never missed a game due to injury, appearing in 184 consecutive contests, the third longest streak in Rams history behind Merlin Olsen and Jack Youngblood.

[13] During Mack's career with the Rams, the club enjoyed a .720 winning percentage with a won-lost-tie record of 129–48–7, won their division eight times (1967, 1969, and 1973–1978), and reached four NFC championship games.

After the game, Mack insisted he had not moved but credited Page with "a smart play" in making contact since a penalty, if called against the Vikings, would have been meaningless.

[5] He eventually became a lobbyist for Bechtel Group, Inc.[18] Mack has a daughter named Carrie who attended Quince Orchard High School in Gaithersburg, MD (Class of 1992).