Known as the most consistent member of one of the most potent offensive lines in NFL history, Slater was selected to seven Pro Bowls and broke a record for most seasons with one team.

[1] He attended Jackson State University, where he played three years alongside Walter Payton, who personally recruited him.

In 1983, Rams' offensive line allowed a league-low 23 sacks while also blocking for running back Eric Dickerson's rookie rushing record of 1,808 yards.

In 1986, Slater was a key blocker for Dickerson as he ran for a playoff record 248 yards and two touchdowns against the Dallas Cowboys in an NFL divisional game.

[2][4] Slater was considered the most consistent members of one of the best offensive lines in the NFL, which also included Pro Bowlers Kent Hill and Dennis Harrah, and was recognized for his "work ethic and leadership skills" when he was inducted to the Hall of Fame.

He was voted the National Football League Players Association's NFC Offensive Lineman of the Year four times—1983, 1986, 1987, and 1989—and was the Athletes in Action/Bart Starr Award winner after the 1995 season.

This record was later matched by Washington Redskins cornerback Darrell Green, Detroit Lions kicker Jason Hanson, and New England Patriots quarterback Tom Brady.

[5] Former teammate Jim Everett stated "Jackie Slater is proof they were playing football in the prehistoric days".