Thomas read medicine in Christian Medical College Vellore, of the Madras University. He was appointed as a consultant respiratory and general physician in 2005 and is based in the West Suffolk Hospital Foundation trust (WSHFT) a University of Cambridge associate Hospital, in Bury St Edmunds. He is now consultant Lead in respiratory medicine and lung cancer. Thomas also works in Addenbrookes, Cambridge University Hospital, in the respiratory department; interventional pulmonology/pleural team.
Thomas has an interest in undergraduate and postgraduate medicine, was appointed tutor and Director of Studies (Clinical) for the Cambridge Graduate course in Medicine (CGCM) for Wolfson in September 2017 following which he was elected governing body fellow. He is also currently co-ordinator and specialist facilitator in clinical communications skills for the CGCM. Thomas was the training program director for respiratory medicine in the east of England deanery and continues on the specialist training committee for respiratory medicine.
Thomas is married to Rebecca Jacob, a consultant psychiatrist in Cambridge, and has two daughters: Nina, practising law in London, and Lisa, reading psychology in Exeter.