Mathieu Ritter founded Emergency Room in 2018 and Overworked in 2021 in Beirut. The brands have a physical store in Beirut and a workshop in Tripoli, Lebanon, where it sources second-hand clothes and fabrics and transforms them using innovative upcycling techniques. Emergency Room presented its Spring-Summer 2024 “Neverland High” collection in October 2023, and its Fall-Winter 2024 “What Am I To Do With All That Is Left,” in February 2024 at Dubai Fashion Week. In May 2024, the brand showcased The Beirut Show 2.0 at the Sursock Palace in Beirut. Mathieu Ritter is also the Director of the Fashion Design Department at the Académie Libanaise des Beaux-Arts at the University of Balamand.