Professor Mathis Grossmann is a Principal Research Fellow at the Department of Medicine, University of Melbourne, Austin Health. He is a Consultant Endocrinologist and Head of Andrology at Austin Health, where he runs Endocrine Men’s Health and Endocrine Breast Cancer Clinics. He graduated with an MD from Heidelberg University Medical School and did his internship in Munich, Germany. He then spent 4 years in basic research at the National Institutes of Health, USA, and obtained a PhD at the Walter and Eliza Hall Institute in Melbourne, followed by clinical training leading to FRACP. He joined the University of Melbourne at Austin Health in 2006. His research focuses on the roles of reproductive hormones in health and disease. His group conducts observational and interventional trials in men with i) low testosterone and chronic disease, ii) hypogonadism, iii) prostate cancer receiving androgen deprivation therapy, and iv) women with breast cancer receiving aromatase inhibition to understand how reproductive hormones regulate musculoskeletal health and glucose homeostasis, both at the clinical and the molecular level.