Career
He played briefly in the National Basketball Association for the Utah Jazz and the Portland Trail Blazers during the 1989-1990 season. Johnston, a 6"8" forward, played collegiately at the University of Tampa from 1984–1988. Johnston was one of the first players drafted by the Miami Heat when they selected him in the third round (59th overall) of the 1988 National Basketball Association Draft, prior to their inaugural season.