Molitor was born in Saint Paul, Minnesota. After graduating from Cretin High School, he was selected in the 28th round of the 1974 free agent draft as a pitcher by the St. Louis Cardinals, but opted instead to attend college at the University of Minnesota. He was a three-year starter for the Golden Gophers, earning All American honors as a shortstop for his sophomore and junior years. Between his junior and senior seasons, Molitor suffered a broken jaw.

Molitor began as a shortstop, then moved to second base when Robin Yount returned from a brief injury. He made his MLB debut in 1978, playing in 125 games and hitting .273 with 6 home runs, 45 RBIs and 30 stolen bases. In 1981, he spent time at center field and right field to avoid the injuries associated with infield play. Molitor was moved to third base before the 1982 season. Molitor was part of a young Milwaukee Brewers team that lost the 1982 World Series in seven games to the St. Louis Cardinals. Molitor batted .355 during the series. In Game 1, he had five hits, a World Series record. During the 1982 season, he hit .302 and led the American League (AL) with 136 runs scored. On May 12, he hit three home runs against the Royals in a 9-7 loss.  Molitor struggled with injuries for much of his early career, being placed on the disabled list six times between 1980 and 1986. In 1984, Molitor struggled with elbow problems, played in only 13 games and ultimately underwent surgery in an attempt to salvage his career. He played in 140 games in 1985, hitting .297 with 10 home runs and 48 RBIs. He followed that with a .281 average, 9 home runs and 55 RBI in 1986. That year he suffered a hamstring injury, returned for a few days, then reinjured it. He played in 105 games that season.  Molitor attracted national media attention in 1987 during his 39-game hitting streak. Near the end of the streak, columnist Mike Downey wrote that "the amazing thing about Paul Molitor's recent bat-o-rama is not that he has hit in 33 straight games but that he has played in 33 straight games." The streak ended with Molitor in the on-deck circle when Rick Manning got a game-ending hit to beat the Cleveland Indians on August 26, 1987. Fans booed Manning for driving in the winning run and thus depriving Molitor of one last chance to reach 40 games. The streak stands as the fifth-longest in modern-day baseball history, and remains the longest since Pete Rose's 44-game hit streak in 1978. Answer this question using a quote from the following article:

When did paul join the brewers?
He made his MLB debut in 1978, playing in 125 games and hitting .273 with 6 home runs, 45 RBIs and 30 stolen bases. In 1981,