Andrew established the firm Andrew Chalk Associates in 1996, which has since undergone transformations to become Chalk & Fitzgerald in 2001 and currently Chalk & Behrendt in 2017. Prior to that, Andrew worked for both a large and small Sydney firm and also for the NSW Aboriginal Legal Service.
Andrew has earned his personal reputation for legal and strategic advice, as well as for his dedication to advocating the interests of his clients, through playing a key role in many successful proceedings and negotiations. This includes his role in:
Representing Indigenous bodies in relation to the enactment of the Native Title Bill 1993, and the Act's amendment in 1997-1998,
Numerous successful Aboriginal land claim appeals in NSW;
Successful native title claims for the Lardil, Kaiadilt, Yangkaal, Gangalidda and Waanyi Peoples in the Gulf of Carpentaria region of Queensland,
Advising Aboriginal Land Councils and representative bodies throughout Australia over many years.
Andrew has written and presented numerous papers on environmental and planning law, administrative law, cultural heritage protection, land rights and native title.
Andrew was the founding Chair of Gawad Kalinga Australia Limited, the regional arm of the international community development organisation. He is also a former Chair of the Environmental Defender's Office Ltd (NSW), a director of the Mark Tonga Relief Fund and the Secretary of the NSW Chapter of the Australian Institute of Administrative Law.