Meirion Thomas trained at Westminster Hospital Medical School and was appointed Consultant Surgeon at his teaching hospital in 1982 where, as a general surgeon, he developed a practice in thyroid and parotid surgery. In 1989, he was appointed to the staff of the Royal Marsden Hospital where he remained until retiring in 2015. During that time, he and his colleagues built up the largest soft tissue sarcoma unit in Europe, with a particular interest in retroperitoneal tumours. In parallel, he and colleagues developed a melanoma unit which has also become internationally recognised. Following a devastating fire in 2008, Mr. Thomas was appointed lead surgeon at RMH until 2013. From 2007 until 2014, he held the Honorary Title of Professor of Surgical Oncology at Imperial College.
Mr. Thomas is now in full-time private practice at the Lister Hospital, Chelsea where he has developed a practice providing rapid access for treating all skin cancers. His extensive experience in undertaking complex surgery is invaluable in his medico-legal practice.
Since 2013, Mr. Thomas has written many articles for the press, some controversial, on subjects he believes are important to maintaining standards and quality of care in the NHS.