Gabbard was originally signed to the Philadelphia Eagles as a free agent offensive tackle and participated in two playoff games. He spent two seasons as a member of the practice squad and suffered a knee injury.After surgery, he was sent to the World Football League (now NFL Europe) to rehabilitate, where he was the first draft selection to the London Monarchs. The Monarchs were 1991 World Bowl Champions, with the offensive line "Nasty Boyz" becoming a fan favorite. He was became a member of the Green Bay Packers during the 1991 NFL season as an offensive lineman and a member of the special teams (long snapper)]. After a year at Green Bay, he was signed as a Plan B free agent by the Washington Redskins. He also played a year in the Canadian Football League for the Sacramento Gold Miners as a starting left tackle. He played at the collegiate level at Florida State University where he was a four-year starter at defensive tackle, was a 1987 Football News All-American, a 1989 AP Honorable Mention All-American and All-South Independent Honorable Mention in 1987 and 1988. The Seminoles were All-American, Gator, Fiesta and Sugar Bowl Champions during his four years as starting defensive tackle. Gabbard also served as a Graduate Assistant Offensive Line coach for three years at Florida State for Bobby Bowden, during which time FSU won the NCAA National Championship (1999) in an undefeated season where they were the #1 ranked team nationally wire-to-wire. Florida State was also runner up to NCAA National Champions Virginia Tech (1998) in the Fiesta Bowl and won the Sugar Bowl (1997) during his time on Coach Bowden's staff.