Dr. Marius Haak

Dr. Marius Haak defends individuals as well as national and international companies in all areas of general (e.g. corruption offences) and special commercial criminal law (e.g. foreign trade and data protection criminal law).

One focus is on supporting (in particular medium-sized) companies in conducting internal investigations and advising on all compliance issues.

Marius Haak studied law at the Julius-Maximilians-Universität Würzburg (specializing in criminal science) and at San Diego State University (specializing in criminal justice) until 2013. Subsequently, Marius Haak completed his doctorate under Prof. Dr. Zieschang (JMU Würzburg) on a criminal corruption law topic and worked for a commercial criminal law boutique in Düsseldorf and Essen during his doctorate. After completing his 2nd state examination in 2017, Marius Haak was employed as a lawyer in the white-collar criminal law department of a major international law firm in Frankfurt am Main. Marius Haak has been working as a lawyer and criminal defense lawyer at Park | Wirtschaftsstrafrecht since 2021 and as a partner since 2024. In 2022, Dr. Haak completed the “Certified Investigation Expert” certification course at the Steinbeis University for Governance, Risk & Compliance. He has been a specialist lawyer for criminal law since 2023.

Marius Haak is a board member of the Deutsche Strafverteidiger e.V. (DStV) and is also a member of the Wirtschaftsstrafrechtliche Vereinigung (WisteV), the AG Strafrecht im DAV and the DICO working group “Internal Investigations & Whistleblower Systems”.

Since 2021, Marius Haak has been a lecturer at the “DeutscheAnwaltAkademie”, where he lectures on criminal procedural topics, such as the defense in search and seizure cases. Since the summer semester of 2025, Marius Haak has also been a lecturer at the University of Münster, where he gives a lecture on whistleblowing

Since 2019, Marius Haak has been consistently named in various specialist publications (WirtschaftsWoche, Legal500) as a highly recommended lawyer in the areas of “(foreign) commercial criminal law” and “internal investigations”. The renowned industry magazine JUVE describes him as an “up-and-coming name in the field of compliance advice”.