Justin is a UNSW Sydney Scientia Professor and currently a National Health and Medical Research Council Leadership Fellow as well as a fellow of the Australian Academy of Science and the Australian Academy of Technology and Engineering and was previously an Australian Research Council Australian Laureate Fellow. He is the inaugural editor-in-chief of the journal ACS Sensors. He is the former founding co-director of the Australian Centre for NanoMedicine and the co-director of the New South Wales Smart Sensing Network.

He leads a research team of over 40 researchers interested in surface modification and nanotechnology for biosensors for medical applications, electrocatalysis and 3D cell printing. He has extensive collaborative experience with start-up companies and has been involved in the commercialisation of glucose biosensors, 3D bioprinters and an in vivo sensing platform for therapeutic drug monitoring.