Thomas is former President of the Association française des hémophiles (2012-2018) and now Honorary President. He is member of the EHC Steering Committee. He is chairman of the AFATH (African French Alliance for the Treatment of Haemophilia) programme in collaboration with the World Federation of Hemophilia dedicated to French speaking countries in Africa. Thomas is currently a member of several WFH committees. He is also a board member of the French Blood Agency, the patient engagement committee of the French High Authority of health and the National School of Public Health.
Thomas is a former lawyer. Today, he designs projects of partnership between patients and healthcare providers for hospitals or medical teams, as well as having worked for more than 13 years on educational programmes for and with patients with chronic diseases and rare bleeding disorders. He is leading the AFH working group on therapeutic education.