Hans Thomeer has been appointed as an otolaryngologist since October 2014 at the UMC Utrecht, chaired by prof. Robert Stokroos. He is dedicated to specialized care and surgical rehabilitation of patients suffering from various otologic and neurotologic diseases (including profound sensorineural hearing loss, otosclerosis, chronic otitis media, superior semicircular canal dehiscence syndrome, etc.), as well as benign and malignant tumours of the skull base (including mainly vestibular schwannoma and paraganglioma surgery). He is also Chairman of the Cochlear Implantation Center Utrecht, where yearly about 90 implantations are done in patients (adults and children). He is the Chief of the Multidisciplinary Skull Base Team Utrecht.

Hans Thomeer performed his PhD-research on congenital middle ear anomalies and surgical outcomes (between 2009 and 2012, Radboud University, Nijmegen (The Netherlands)) and was appointed as an associate professor at the Faculty of Medicine and Brain Center Rudolph Magnus at the University of Utrecht. Since October 2023 he has accepted a position as Guest Professor at the Catholic University Leuven (Belgium) focussing on Inner Biology and Treatment. 

He has currently published over 80 peer-reviewed journal articles.