After graduating with a degree in administration from the University of Applied Sciences in Wiesbaden and a Master of Public Administration from the University of Kassel International Management School, Frank Müller was initially head of the public order office in his home community of Buseck and of the building, public order and citizens’ office in the town of Hungen, before spending ten years working in the spa and baths sector in the spa town of Bad Nauheim as head of operations/head of the spa and service department. From 2013 to 2020, as managing director of BBF BäderBetrieb Frankfurt GmbH, he was significantly involved in its reorganisation and the development of the Frankfurt baths concept, in the context of which the new Rebstockbad and Bornheim family baths were planned. Since 2020, he has been the manager of the Wiener Therme GroupTM and has been entrusted with the international location development of the company.