Dr Perros is a Consultant Endcorinologist at Newcastle upon Tyne Hospitals Foundation Trust and Honorary Senior Lecturer, University of Newcastle upon Tyne. He trained in Newcastle, Glasgow and Edinburgh. He has a longstanding clinical and research interest in thyroid diseases.

He is currently president of the European Group on Graves' Orbitopathy. He has served as Trustee of the British Thyroid Foundation and is Trustee and medical advisor to Butterfly Thyroid Cancer Trust and medical advisor to Thyroid Cancer Alliance.