 He was appointed a judge of the Supreme Court of Queensland in 1985 and was the commercial causes judge between 1986 and 1989.He was the judge constituting the Mental Health Tribunal between 1994 and 1996, the president of the Queensland Industrial Court between 1996 and 1997, and the chairman of the Law Reform Commission of Queensland from 1996 to 1997.De Jersey was appointed Chief Justice of Queensland on 17 February 1998.