Mathias Grzesiek
Rosinus PartnerIn addition to preventive advice, Rosinus Partner boasts expertise in forensic compliance and supports companies and corporations in allegations of embezzlement, cum-ex, corruption and tax evasion. The team is also experienced in advising on employee misconduct and matters pertaining to the diesel topic. Criminal lawyer and compliance expert Christian Rosinus co-leads the team with Mathias Grzesiek, who specialises in IT criminal law, data protection and cyber criminal law. Mirjam Steinfeld is experienced in sanctions and criminal defense and was appointed to salary partner in February 2024.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
- 'Small but fine team of experienced partners and young, motivated colleagues.'
- 'Christian Rosinus is very smart and quick; very empathetic and far-sighted; a good speaker and explainer.'
- 'Mathias Grzesiek is excellent in the individual support of employees in large internal investigations, whereby IT-technical connections in particular are quickly understood and central issues are clarified without IT experts.'
- 'The young and diverse team at Rosinus Rechtsanwälte has been convincing for years with practice-oriented solutions and a high level of willingness to integrate technical innovations directly into everyday professional life, especially in the area of internal investigations.'
- 'The collaboration with Janina Brandau and Mathias Grzesiek, with whom we mainly work, is always very pleasant due to their responsiveness and outstanding internal and external coordination, even in complex and confusing situations.'
- 'The team around Christian Rosinus and Mathias Grzesiek has extensive experience with complex issues and corresponding procedures. Both individual and corporate representation are their strengths.'
- 'Mathias Grzesiek has his finger on the pulse of digital issues. Whether it's compliance, white collar criminal law, etc., a thorough knowledge of the digital world is required everywhere. Added to this is his expertise in cybersecurity.'
- 'Christian Rosinus is an expert in his field with a very good understanding of the clients' financial situation.'
Key clients
- Condor Flugdienst GmbH
- Frosta AG
- MHI Gruppe
- VDE
- Magura Bosch
- GEW Wilhelmshaven
Lawyers
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.