Dr Sagner is the Ageing Research at King's (ARK) Clinical Advisor in longevity and preventive medicine. He is a clinician and researcher specialising in sports medicine and preventive medicine. He is a Certified Nutritionist and completed his MD at Technical University Munich. He specialises in Sports Medicine, Endocrinology and Preventive Medicine, and had an affiliation with the College of Applied Health Sciences, University of Illinois at Chicago. He is the Editor-in-Chief of Longevity, Lead Editor of Lifestyle Medicine, Fellow of the Royal Society of Medicine and Fellow of the European Society of Preventative Medicine.  

Dr Sagner was the Medical Director and attending physician in the Section for Preventive Medicine and Lifestyle Medicine, University of Hamburg Medical Center. He then co-founded a private clinic group and research institute for cardiology, metabolism, endocrinology, preventive medicine and sports medicine where he looks after elite athletes and executives. As a clinician he has spearheaded interventions in the field of endocrinology and cardiometabolic prevention such as the use of GLP1 agonists in Europe. His focus is on interdisciplinary approaches, looking at the systems of the human body as part of an integrated whole, incorporating biochemical, physiological, and environment interactions and translating these systems biology principles into clinical practice. He works on the convergence of systems biology and consumer-driven healthcare to transform medicine from its current reactive approach to an approach that is predictive, preventive, personalized and participatory (P4). As a public health expert, he has spearheaded several international initiatives in the field of systems biology driven preventive medicine working with governments and NGOs. One of his interests is closing the gap between clinical practice and public health to promote more effective and patient-oriented care and preventive interventions. For that he has collaborated with many NGOs such as the World Heart Federation (WHF), the World Obesity Federation and the World Health Organization (WHO) where he established the ‘cell to community’ approach in prevention.

Dr Sagner is the Founder and Executive Director of the European Society of Preventive Medicine, and partner of the European Innovation Partnership on Active and Healthy Aging. He was a member of the European Union Platform for Action on Diet, Physical Activity and Health, and the UK All-Parliamentary Group for Longevity.

His areas of research are: Advanced Preventive Medicine, Systems Medicine, Metabolism, Noncommunicable Diseases, Longevity, Muscle Physiology and Cardiometabolism and has published numerous articles in this area.