Dr. Seth O’Neill is a physiotherapist and internationally recognised authority on tendon pathology, specialising in tendinopathy, tendon ruptures, and lower-limb muscle injuries—particularly those affecting the calf and Achilles tendon. His research integrates epidemiological, biomechanical, and mixed-methods approaches to optimise tendon health in both athletic and clinical populations.

Since 2006, he has led major research initiatives, including large-scale epidemiological studies and clinical intervention trials, supporting both NHS and elite sport settings. His doctoral work on Achilles tendinopathy established a biomechanical foundation for understanding symptom development, with subsequent research identifying key risk factors and highlighting the central role of the soleus muscle in symptomatic athletes.

Dr. O’Neill has authored over 200 peer-reviewed publications and is a frequent speaker at national and international conferences. His research interests also extend to the development of international tendon-health databases, injury prevention strategies, and biopsychosocial models of care. He has been instrumental in integrating cognitive functional therapy into tendinopathy and low back pain management, bridging clinical physiotherapy with evolving psychological frameworks for pain and function.

Dedicated to research mentorship, he supervises undergraduate through doctoral projects and actively supports self-funded PhD candidates in musculoskeletal science. His work exemplifies the translation of rigorous research into patient-centred physiotherapy practice.