Mark was admitted a barrister in 1987 and was contracted as a Crown Prosecutor to the office of the Director of Prosecutions for 2 ½ years. Mark was admitted to the role of High Court barristers in 1989 after which he commenced private practice as a Barrister until April 1995.

Mark changed his admission to a solicitor in 1995 commenced practice as a solicitor in July 1995.

Mark was formerly a solicitor with Minter Ellison Lawyers, Brisbane, partner of Gold Coast firm, Primrose Couper Cronin Rudkin and Special Counsel to McDonald Balanda & Associates.