Dr Olivia Ly Lesslar is an Australian medical doctor who has an expertise in complex chronic conditions including neurodegeneration, "mystery illnesses", atopy, and cancer. Psychoneuroendoimmunology - the intersection of psychology, hormones, the nervous system, and the immune system is her particular passion, and she speaks regularly on podcasts, and at conventions and seminars. After medical residency in Australia, she worked across the USA. First with double-board certified neurologist and psychiatrist Dr Jay Lombard at the Neuroimmunology Associates of New York and currently, with Dr Chris Renna at LifeSpan Medicine, Los Angeles. Since 2020 she has spent more time in her home country of Australia, and now works with internationally renowned Professors - neurosurgeon Charlie Teo and immunologist allergist Pete Smtih at their respective clinics. In 2022, she was featured in the NYC Journal 50 under 50 as a distruptor in her industry.