Sebastian's legal practice focuses on banking law, particularly all civil and regulatory law aspects of payments - including those card-base. He advises both German and international clients on banking regulation and capital markets law; he also represents his clients in court proceedings relating to both banking and payments law. In addition to all this he deals with the legal aspects of innovative business models in the financial sector - commonly referred to as FinTechs. Sebastian joined CMS in 2016. He acts as examiner in banking and capital markets law at the University of Kiel, alongside his practice.