Professor Steier's training in medicine commenced at the University of Leipzig in Saxony. Following graduation, he worked on his MD thesis entitled “Transthoracic Echocardiography in Pulmonary Hypertension” and gathered work experience in Zurich, at the University of Alabama in Birmingham and in Bavaria. His respiratory training led him to the Western German Lung Centre at the University of Essen. His interest in respiratory physiology and sleep-disordered breathing brought him to London on a long-term research fellowship of the European Respiratory Society (ERS). His studies concluded in the PhD thesis on "Sleep-Disordered Breathing and the Respiratory Muscles” at King’s College London. The projects with the London Respiratory Physiology group resulted in research publications with involvement in an impact case and the development of new intellectual property. His work in the field of respiratory and sleep physiology has evolved into collaborations across six continents. Professor Steier works as Consultant at Guy’s & St Thomas’ NHS Foundation Trust in the Lane Fox Unit, a tertiary service for weaning and non-invasive ventilation. He is also placed at the British Sleep Society (BSS) accredited Sleep Disorders Centre of King’s Health Partners. He was awarded the chair for Respiratory and Sleep Medicine at King’s College London. He is member of the executive committee of the British Sleep Society (BSS), task force member of the ERS, and currently serves as President of the BSS.