Thomas works as a Senior Consultant and Project Manager for SchlumbergerSema, formerly Sema Group. He is also head of the SchlumbergerSema internal XML Network. He has been working on XML-based Thesauri and Gazetteers since years, using Topic Maps since 2000. Currently he is managing a R&D project developing a governmental Portal within the scope of environmental protection in Germany.

He is a member (prospective in March, 2002) of the OASIS Topic Maps Published Subjects Technical Committee, and a member of the OASIS Topic Maps Published Subjects for Geography and Languages (GeoLang) TC.