Ofsted's head of research has complained on Twitter of being turned down in his application for "settled status" in the UK after Brexit.
Professor Daniel Muijs, a senior figure in England's education watchdog, has held posts in Southampton, Manchester, Newcastle and Warwick Universities.
Originally from Belgium, he has worked in the UK for more than 20 years.
The Home Office says he has not been "refused", but more information needs to be supplied.
Prof Muijs, whose research work has helped to improve schools in England, has so far not been accepted by the application process for EU citizens wanting to continue living and working in the UK after Brexit.