She then commenced teaching and research at the University of Melbourne in the Department of Psychology. Returning to Macquarie University in 2007, she took up a CORE research appointment at MACCS and in 2010, she was appointed Scientific Director of the Macquarie Centre for Cognitive Science and then became Head of the Department of Cognitive Science. Castles is a member of the Council of Learning Difficulties Australia, Fellow of the Academy of Social Science in Australia, and Chair of the Steering Committee of the NSW Centre for Effective Reading. Castles research over more than 20 years has looked into the nature, causes and treatment of different types of reading difficulties, as well as the process of normal reading development. She has published over 100 articles and several books. She is also a Fellow of the Royal Society of New South Wales. Castles has been critical of the Arrowsmith Program, which has been incorporated in public and private schools in Canada, the United States, Australia, and New Zealand, and is claimed to help students with learning disabilities by using research in neuroplasticity theories. Castles has stated that there is "a clear lack of independent research to support the program's claims", and no study has been published in a peer-reviewed journal on the Arrowsmith program. Castles is on the editorial board of the academic journal, Scientific Studies of Reading and has produced the Free Reading Assessment Tests for teachers. She has also provided extensive discussion in the media on the issue of dyslexia in school children's learning.
Works
Castles, A., & Nation, K... Orthographic Processes in Reading. Special issue of the Journal of Research in Reading. Oxford: Blackwell Publishing
Friedmann, N., & Castles, A.. Reading impairments: Dyslexias in Hebrew. In G. Khan, Encyclopedia of Hebrew Language and Linguistics. Boston: Brill Academic.
Castles, A. & Nation, K.. How does orthographic learning happen? In Andrews, S., From inkmarks to ideas: Challenges and controversies about word recognition and reading. London, UK: Psychology Press.
Castles, A., Davis, C. & Forster, K.I.. Word recognition development in children: Insights from masked priming. In Kinoshita. S. & Lupker, S., Masked priming: State of the Art. London, UK: Psychology Press.