Mathias specializes in white collar crime and compliance.

He defends national and international corporate clients, their executives and board members against criminal allegations of any kind, advises on risks arising from all areas of white collar crime and conducts internal investigations in Germany and abroad. In the field of medical and pharmaceutical criminal law he also advises and defends freelance professionals. A further focus of his work is coordinating the defence of employees and communicating with investigation authorities.

Mathias is both a lawyer and a licensed physician. Before joining Hengeler Mueller, he worked as a judge at a German court, focusing on criminal matters.


  • Universitäten Mainz und Bonn (Dr. med.)


  • Würzburger medizinhistorische Mitteilungen 29, 194-207 (2010), Ergotismus convulsivus – Die krampfende Form der Mutterkornvergiftung an einem Beispiel aus dem Jahr 1738 (zusammen mit Dr. Helmut Priewer)
  • Würzburger medizinhistorische Mitteilungen 30, 287-309 (2011), Periodisch auftretende Pockenausbrüche (zusammen mit Dr. Helmut Priewer)
  • Epilepsie und Strafrecht – eine Auswertung gerichtlicher Entscheidungen aus den Jahren 2000 bis 2015, Dissertation, Bonn, 2015
  • Risk & Compliance, 80-85 (Apr-Jun 2018), Is there such a thing as “useful illegality“? (zusammen mit Prof. Dr. Wolfgang Spoerr)
  • Risk & Compliance, 207-212 (Jul-Sep 2018), Cross-border internal compliance investigations in Germany and legal privilege: balancing the needs (zusammen mit Prof. Dr. Wolfgang Spoerr)
  • Financier Worldwide, 85-87 (Sep 2018), New corporate criminal liability in Germany – paradigm shift or evolution? (zusammen mit Prof. Dr. Wolfgang Spoerr)