Nigel Camilleri was born in Malta, married to Debbie and the father of three daughters Kate, Neena and Sophie. He studied medicine and surgery at the University of Malta where he was awarded an MD in 2003. He then started practicing medicine at St. Luke's Hospital, Malta and eventually started his psychiatry training at Mount Carmel Hospital, Malta in 2006.

In 2008 he moved over to Newcastle, UK and training in psychiatry in the North East of England. Since 2015 he started working as a Child and Adolescent Psychiatrist at Mount Carmel Hospital Malta and St James Hospital, Malta. He has worked as a consultant psychiatrist in an adolescent in-patient and adolescent forensic in-patient unit in Middlesborough, UK and as a Consultant in Child and Adolescent Psychiatry in the Tees Esk and Wear Valleys NHS Foundation Trust, at the Child and Family Department in Durham. He is also an Associate Clinical Researcher at Newcastle University, currently working with Paediatric Bipolar Disorder Team on research projects in this field. He is currently working as a consultant psychiatrist and is the clinical lead for child and adolescent psychiatry at Mount Carmel Hospital , Malta, he is also the service lead for the first Child and Adolescent Mental Health MDT on the island in the private sector (TASSC).

Over his formative training years and during his time working as a volunteer with charities in developing countries. He developed a special interest in working with ‘hard to reach' Young People suffering from multiple complex mental health disorders. In 2011 he had an Out Of Program experience working on the ‘Innovations Project 15-25 years' which was funded by the Strategic Health Authority. He has recently completed and was awarded an MD Newcastle, University, UK for his research. This consisted of a case control study and 2 year follow up study on this cohort of young people compared with a young people who attended a community mental heath team.