Colleen Loo is Professor of Psychiatry at the University of New South Wales, NHMRC Leadership Fellow and Professorial Fellow at the Black Dog Institute, Sydney; Australia. She qualified in medicine and psychiatry in Australia (MB BS, FRANZCP) and completed a research doctorate in 2003 (MD). She was chair of academic psychiatry at St George Hospital (2006-2021), founded the Neurostimulation service at the Black Dog Institute in 2014, and is Regional Medical Director of ECT and Interventional Psychiatry (including ketamine treatment) at Ramsay Clinics in Sydney. She was President of the International Society for ECT and Neurostimulation (2018-2020) and is an editorial board member of the journal Brain Stimulation.

Her research interests are in developing novel treatments for depression and other psychiatric disorders, focussing on transcranial magnetic stimulation, transcranial direct current stimulation, electroconvulsive therapy and ketamine, and their effects on brain functioning. She has published over 200 peer-reviewed papers and has received grant funding from the Australian NHMRC, US-based NARSAD and Stanley Foundations, UK NHS/MRC and Singapore NMC.