Dr Gilluley qualified in Medicine from the University of Glasgow in 1991.  He subsequently trained in psychiatry and was appointed Consultant Forensic Psychiatrist for Westminster in 2000. 

Dr Gilluley has worked in a number of clinical settings and also spent time working in NHS London Specialist Commissioning.  He helped develop the Quality Network for Forensic Psychiatry at the Royal College of Psychiatry and went onto be specialist advisor in Forensic Mental Health to the Care Quality Commission. 

In 2012 he moved to become Head of Forensic Services at ELFT where in 2017 he became Chief Medical Officer.  During the COVID pandemic Dr Gilluley provide clinical leadership in the roll out of the COVID vaccine across North East London. 

In July 2022 Dr Gilluley was appointed Chief Medical Officer at NHS North East London.