Mattis advises national and international clients on individual and collective employment law.

He focusses on M&A transactions and compliance matters as well as redundancies and works constitution law. He represents clients before local and state labour courts.

Mattis studied law in Cologne and finished university in 2012. During his legal traineeship, he worked in employment law teams of other international law firms. Mattis was lawyer in another large law firm for three years before joining Osborne Clarke.