Gideon has a broad criminal and civil practice. He practises in the areas of criminal law (trial and appeal), personal injury (including medical negligence) and tort law, as well as other civil and commercial areas. He has expertise in evidence law, which he teaches, and has considerable experience in complex litigation, both in Australia and internationally. Gideon is briefed in a number of complex serious criminal matters, traversing terrorism, foreign incursions and slavery, as well as for a number of plaintiffs seeking damages for historical sex abuse.
Gideon is a Victoria Legal Aid Criminal trial preferred barrister. He is also an accredited specialist criminal law advocate under the Victorian Bar's Indictable Crime Certificate program.
Gideon has worked as a solicitor in criminal and personal injury matters. He was a Senior Legal Officer at the United Nations International Criminal Tribunal for the former Yugoslavia (ICTY), where he led the Chamber’s legal team in the Milosevic case, and has acted as counsel for alleged war criminal, Radovan Karadzic, accused of genocide, crimes against humanity and war crimes before the ICTY. He is a Professor in the La Trobe Law School.