Ulrich Sorgenfrei

2020: Foundation of the law firm Klötzer-Assion 2004 – 2020: Attorney at law in a renowned boutique specializing in white-collar crime law, 2014 - 2020 as equity partner 2004: Admission to the bar by the bar association Frankfurt am Main extra-occupational 1995 - 2004: Law studies at the Johann Wolfgang Goethe University in Frankfurt am Main / legal clerkship 1995 - 2004: Federal Customs Administration, 1996 - 2004 Investigating officer in the customs investigation service 1992 &nd...

Criminal defense since 2007 During this time I was able to learn and experience a great deal – experiences that shaped me, sharpened my understanding of criminal law and influenced my current way of working. My path to criminal defense, however, began much earlier. Even during my studies in Konstanz, I consistently focused on criminal law. During my legal traineeship, I also deliberately chose placements with a criminal law focus – including a renowned criminal defense lawyer spec...

Victoria Johnson is a specialist lawyer for information technology law, TÜV-certified data protection officer and auditor, and certified whistleblowing officer based in Berlin. While completing a part-time doctorate in commercial law focused on fundamental rights, she advises public and private sector clients—from start-ups to international corporations—on all aspects of digitisation, IT law, and data protection. Her expertise includes contract drafting, data protection manag...

Lars Weber is a top attorney recognized by Best Lawyers in the practice area(s) of Mergers and Acquisitions Law. Lars, who practices law in Frankfurt/Main, Germany, has been recognized since 2025. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Lars is held by other top lawyers in the same geographic and legal practice area.

Dr. Ulrich Ziegler is a certified lawyer focusing on labour law with more than 25 years of experience in the field. He provides advice to both German and foreign companies in individual as well as collective labour law issues and in labour law disputes with employees and employee representatives. Dr. Ziegler has significant experience with the employment-related aspects of M&A and cross-border transactions, and restructuring measures, such as site closures and plant relocations, including...

Jan Vollkammer is a top attorney recognized by Best Lawyers in the practice area(s) of Competition / Antitrust Law. Jan, who practices law in Frankfurt/Main, Germany, has been recognized since 2026. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jan is held by other top lawyers in the same geographic and legal practice area.

Thomas Nickel is a top attorney recognized by Best Lawyers in the practice area(s) of Real Estate Law. Thomas, who practices law in Frankfurt/Main, Germany, has been recognized since 2022. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Thomas is held by other top lawyers in the same geographic and legal practice area.

Mark Oliver Kühn is specialised in offering legal advice on information technology and privacy law, industrial property rights as well as contract and commercial law. Mr Kühn advises and supports national and international companies in designing corporate processes to ensure legal certainty, in particular in the fields of software contract law and open source, IT outsourcing and project contracts, data privacy and protection, e-commerce and multimedia law, electronic payment systems...

Dr. Kamyar Abrar is a partner in the Corporate & Financial Services Department, where he focuses on private equity and M&A transactions, including distressed transactions. He has handled numerous transactions in a variety of industries. He is also Co-Managing Partner of Germany. Kamyar also counsels clients on a wide variety of antitrust and compliance issues, ranging from mergers and acquisitions, B2B exchanges, joint ventures and distribution practices to civil litigation. He has re...

Jürgen A. Heilbock is a top attorney recognized by Best Lawyers in the practice area(s) of Mergers and Acquisitions Law. Jürgen A., who practices law in Frankfurt/Main, Germany, has been recognized since 2013. This recognition is based on an exhaustive peer-review survey, reflecting the high esteem in which Jürgen A. is held by other top lawyers in the same geographic and legal practice area.