Jelmer Alsma is an internist specialized in acute medicine. He works at the Erasmus University Medical Center, Erasmus MC, Rotterdam, The Netherlands. He is the director of the acute medicine residency program, head of the section acute medicine of the department of Internal Medicine and secretary of the section Acute Medicine of the Dutch Society of Internal Medicine. In 2019 he successfully defended his PhD-thesis titled “Prediction of the severity of illness and outcomes in the emergency department”. His areas of interest in research are prediction models, determinants of illness and sepsis and he has (co)-authored more than 50 peer reviewed articles. He introduced the Flash Mob Research method in the Netherlands with a study on capillary refill time, and contributed to subsequent studies using this method.

He also is active in the organization of medical care in several major sporting events, such as the Rotterdam Marathon, the cycling event 'Tour de Rotterdam' and the Rotterdam Swim, and has expertise in heat-related illness and metabolic conditions during exercise. In 2021 he was one of the doctors for TeamNL (the Dutch Olympic Team) during Tokyo2020. Currently, he is also one of the doctors of the Netherlands men's national field hockey team.