Johnston took 46 passes through his career at college and ran for 1,830 yards. From 1989 to 1997, he played successively in 149 games. Johnson succeeded in scoring 22 touchdowns which included additional receptions as compared to carries. As a young football player, Johnson began to play for special teams and started playing at fullback, in 1986.
In 1993, Johnston held 50 receptions and had an average of 7.4 yards for every catch. It was mostly due to his input that the NFL was able to generate the fullback in the demonstration match. The same year he became the first-ever fullback chosen for playing in the Pro Bowl. He was ranked amongst the finest fullback players of his time.
He retired by the last fraction of 1999, following an injury of the neck that reduced his football career. Johnston remained associated with the three captivating teams of the Super Bowl. These days, Johnston is working as a sports analyst in a Fox Sports production, together with Kenny Albert.
Lately, he was appointed as a forecaster, by NFL Network, for the program, “Total Access”. Besides this, Johnston performed as a guest star, in one of the episodes of ‘Wishbone’, a popular television series of the PBS.