Dr Mark Lewis is an Australian clinician with thirty years of experience across pharmacy, emergency medicine, and integrative and longevity medicine. Having worked at the sharp end of acute care, he became increasingly focused on a simple question: what could be done earlier to keep people from arriving in crisis in the first place?

That question led him to longevity medicine — and ultimately to this book. Dr Lewis founded Helix Longevity to bring evidence-based, practical healthspan medicine to everyday Australians. Live Well, Age Better is his first book, written specifically for Australians aged 40–65 who want to take their long-term health seriously — without the hype, the extreme biohacking, or the American context that doesn't quite fit.