Stephan is working at BaFin as Lead Senior Officer in the department responsible for the supervision of financial market infrastructures (Central Securities Depositories, CSDs and Central Counterparties, CCPs) also being responsible for the DLT Pilot Regime team within BaFin. During the last nine years, Stephan had a specific focus on new technologies such as DLT, Blockchain and Cloud and the potential implications of these technologies applied to post-trade services. At the moment, he is the Chair of the ESMA DLT Working Group. Furthermore, he contributed as seconded national expert to the work of the ECB in the fintech-team of DG-MIP analysing Blockchain and crypto-assets (in particular, project Stella phase II and related policy workstreams wrt crypto-assets). In addition, Stephan contributes as member of international working groups to the ongoing analysis of DLT, Blockchain and tokenisation in the context of the CPMI-IOSCO PFMIs. Finally, Stephan was involved internally in various legislative procedures such as the DLT Pilot Regime, MiCA and the German Electronic Securities Act.