Maceau grew up in Wisconsin and played football at the collegiate level at Marquette University. He served for two years in World War II between 1943 and 1944 before returning to Marquette at the end of the 1945 season. Maceau then signed with the Browns, where he played as a backup center for three years. Paul Brown, Cleveland's head coach, waived him before the 1949 season, and he retired from professional football. The Browns won the AAFC championship in each of the years Maceau played for the team.
Maceau played with the Browns for three seasons between 1946 and 1948; the team won the league championship in each of those years. Maceau was a third-stringer behind Mike Scarry and Frank Gatski at center, but he got playing time in late 1947 when Scarry was injured, substituting as a defensive lineman. Before the beginning of the 1949 season, Cleveland coach Paul Brown released Maceau on waivers, allowing other teams to pick him up. Maceau then retired from professional football.
↑Sauerbrei, Harold (November 6, 1947). "Browns Unveil Two Able Subs for Scarry". Cleveland Plain Dealer: p. 24. "Coach Paul Brown has had one of those pleasant surprises with the performances of Frank Gatski and Mel Maceau at the pivot position. Gatski has been handling the offensive duties and Maceau has worked defensively ever since Scarry's injury."