Bunn was recruited from East Doncaster, Victoria and captained the Fitzroy U/19's before playing for Seniors for the Fitzroy Football Club between 1990 and 1992. He made 30 appearances with the club, coming Runner-Up to Scott Clayton in the 1990 Best & Fairest (his debut season) after playing just 17 games. After two further injury affected seasons, he was drafted by the Hawthorn Football Club in 1993. He played 23 Senior games, including one final, and won another two Reserve Best & Fairests (he won one at Fitzroy also). He mainly played through the midfield and as a backman.
Mark Bunn is now a conference guest speaker who speaks on health & wellbeing, work-life balance, peak performance & motivation. Trained in both Western health science and the popular new trend toward 'mind-body medicine (Maharishi Ayurveda), he presents as a health & wellness speaker at conferences and runs training programs to top business groups throughout Australia.