Dr Olivia Ly Lesslar is an Australian medical doctor specialising in psychoneuroimmunology and longevity medicine. Known as a “medical Sherlock Holmes,” she is recognised for her investigative approach to diagnosing and managing complex, multi-systemic conditions that challenge conventional frameworks.

Dr Lesslar is the Director of Functional and Longevity Medicine at Cingulum Health in Sydney, where she integrates neuroplastic therapies and transcranial magnetic stimulation with functional medicine for neurological and psychiatric care. She also serves in leadership and advisory roles across more than thirty international organisations spanning neurotechnology, biotechnology, and space medicine, including Human Regenerator (UK), L’evive Labs (Singapore), Sens.ai (Canada), ANI Biome (Croatia), and Oxford Healthspan (UK).

In 2025, she completed a seven-city speaking tour across Australia and New Zealand presenting her original framework, The Nine Ancient Survival Threats, which examines the evolutionary roots of chronic disease.

Dr Lesslar holds academic appointments at Griffith University’s National Centre for Neuroimmunology and Emerging Diseases and the Geneva College of Longevity Science. Her research and teaching focus on advancing integrative, patient-centred models of care that unite neuroscience, immunology, and behavioural science.