Dr. Tamsin Lewis — known to many simply as Dr. Tam — founded Wellgevity in 2011 to bring together the science of longevity and the art of personalised, human-centred care.  A graduate with honours from King’s College London and Guys & St Thomas’ Hospitals, Dr. Tam holds a BSc in Neuroscience and the Biology of Ageing. With specialist training in psychiatry and sports medicine, and further education in nutritional and functional medicine, she has been working at the intersection of mind, body and performance since 2007.  Dr. Tam is a member of the Royal College of Psychiatrists (MRCPsych), a founding trustee of the British Society of Lifestyle Medicine, and an advisory board member for Humanity.Health, a digital health company supporting proactive, data-led health tracking. She was formerly Medical Director at RoseBar Longevity with Six Senses, where she helped shape one of the first fully integrated luxury longevity offerings globally. 

Dr. Tam competed as an elite triathlete for Great Britain, preparing for the 2012 Olympics. She went on to win the Ironman UK Pro Championship in 2014. This background in elite sport has deeply informed her performance mindset and continues to influence her work in healthspan optimisation and resilience coaching.  Dr. Tam’s areas of expertise include: 

Emotional health and resilience in the context of longevity 

Hormonal transitions and advanced women’s health

Gut-brain health and systems biology

Interest in peptides and biomodulators

Personalised supplementation and movement plans, Wearable technology and digital health integration  She is also actively engaged in the evolving field of psychedelic-assisted therapy and neuroscience research, learning from leaders such as Dr. Robin Carhart-Harris at Imperial College. This adds depth to her ongoing interest in emotional healing and conscious transformation.  At Wellgevity, Dr. Tam brings together her medical training, sporting experience, and ongoing study of human potential to support clients through truly personalised, holistic, and forward-thinking health strategies.

Her approach is relational, data-informed, and rooted in behaviour change science — helping clients improve how they feel now, while building strong foundations for long-term health and vitality. 

A lifelong learner, Dr. Tam is committed to collaboration and knowledge-sharing — curating a trusted network of practitioners and fostering a community of open-minded, proactive individuals. Through Wellgevity, she continues to pioneer new models of care that integrate body, mind, and future-focused health insights.