Callan joined Gilshenan & Luton in 2011 and was appointed as a director of the firm in 2020.

He appears in a wide variety of complex criminal and professional discipline proceedings. He has appeared as solicitor advocate, and instructing solicitor, in superior court hearings and sentences, coronial inquests, disciplinary hearings, and commissions of inquiry.

Callan has a particular interest in assisting other lawyers with professional discipline proceedings involving the Queensland Law Society and/or Legal Services Commission, as well as other professionals in misconduct investigations and hearings. A significant aspect of Callan’s practice includes advising and representing government bodies in regulatory prosecutions, and in the enforcement of their statutory powers.

In 2018, Callan attained his specialist accreditation in criminal law, acknowledging his high level of practical skill and knowledge within the criminal law practice area. 

Callan is Chair of the Queensland Law Society’s committee for Specialist Accreditation in Criminal Law and is also a member of the Proctor Committee (the Law Society’s monthly magazine for the profession). He has also published numerous articles in various journals, and since 2012 has been the annual editor of the Queensland College of Law’s text on Conducting Pleas of Guilty in the Magistrates Court.

Callan is married to Nicole and they have two children. He enjoys trail running and trips to the beach. Callan has represented Australia in triathlons and competed at the Ironman and Ultraman distances.