Dr. Liisa Galea is the Treliving Family Chair in Women’s Mental Health at the Centre for Addiction and Mental Health in Toronto and a Professor in the Department of Psychiatry at the University of Toronto. She leads the Women’s Health Research Cluster with >1000 members across 43 countries, a dedicated network to promote, expand and catalyze impactful women’s health research. Dr. Galea is a world-renowned expert in sex and sex hormone influences on the brain, with a focus on stress-related psychiatric disorders and dementia. Although sex differences exist in many brain diseases, research targeting sex as a factor in brain health has been scarce. Dr. Galea’s research is vital in filling this knowledge gap, specifically in understanding how hormones influence neuroplasticity in females as too often women’s health is ignored in research. The goal of her research is to provide clues for devising new therapeutic treatments for diseases that involve neuronal loss and show greater prevalence in women, such as Alzheimer’s disease and depression. She developed the first rodent models for perinatal depression 25 years ago, and her research continues to reveal novel insight into the mechanisms by which pregnancy and motherhood impact risk for psychiatric disorders in the short term, and the trajectory of cognitive ageing, in the long term.