He played seventeen seasons in Major League Baseball (MLB) as a third baseman, most notably for the Montreal Expos from 1980 to 1992.

Wallach was born in Huntington Park, California, grew up in Tustin in Orange County, and attended University High School in neighboring Irvine.

[citation needed] Wallach led the Titans to its first Division I title at the College World Series in Omaha in 1979,[3][4] was named to the all-tournament team, and won the Golden Spikes Award.

[2] Wallach made his major league debut at the age of 22 on September 6, 1980, against the San Francisco Giants after replacing Ron LeFlore at left field.

Wallach and Brett Pill (September 6, 2011) are the only two players from Cal State Fullerton to hit a home run in their first at bat.

He regressed a bit the next season, hitting .257 with 32 doubles, 12 home runs and 69 RBIs in 159 games, although he did win his second Gold Glove.

[5] Wallach played in 133 games for the Dodgers, getting 106 hits (his lowest since having 112 in 1986), with 19 doubles, 12 home runs and 62 RBIs with a .222 batting average.

He played in just 97 games for the Dodgers in 1995, having 87 hits (his lowest since having 50 in 1981) with 22 doubles, nine home runs and 38 RBIs and a .266 batting average.

He played in 57 games with the team, having 45 hits, seven doubles, eight home runs and 20 RBIs with 47 strikeouts on a .237 batting average.

[7] Wallach was one of the last Major League Baseball players to wear a flapless batting helmet, after Tim Raines and Gary Gaetti and equal with Ozzie Smith.

Wallach spent the majority of his career with the Expos, forming a potent lineup with teammates Tim Raines, Gary Carter and Andre Dawson.

Bill James has referred to Wallach as a "poor man's Brooks Robinson", largely because of his defensive skills.

[11] He led the Isotopes into the playoffs with a franchise record 80 wins and was named as Pacific Coast League Manager of the Year.

Chad was a catcher for California State University Fullerton who was selected by the Miami Marlins in the 5th round of the 2013 MLB draft and was traded to the Cincinnati Reds in 2014.