Prof. dr. Bert van der Horst is professor of Chronobiology & Health at Erasmus MC in Rotterdam. He is fascinated by the impact of our 24/7 society on health and disease. Current research efforts focus on the development of biomarkers that allow an objective and quantitative assessment of the adverse effect of shift work, (social) jet lag, and other conditions that disturb the circadian system. Such biomarkers are prerequisite to develop evidence-based measures that alleviate shift work-associated health risk and contribute to sustainable health and employability.