As an Of Counsel for Bird & Bird in the practice group Media, Entertainment and Sport in Düsseldorf, Germany, he is an expert sports lawyer, with decades of experience. He is also a certified specialist lawyer in employment law.

He is listed as a top lawyer in the field of sports law in various leading legal guides. The JUVE Handbook of German Commercial Law Firms rates him as one of the most recommended lawyers in sports law. Further he was named as one of the World's Top 20 Most Influential Lawyers in sport by SportBusiness International magazine. 

As a former member of the German national basketball team, he began his career advising athletes, sports associations and unions in amateur and professional sport at national and international level. He was a member of the Legal Committee and the Anti-Doping-Commission of the German Basketball Federation as well as a member of the Arbitration Body of the German Ice Hockey League.

Since 1999, he has been an arbitrator of the Court of Arbitration for Sport (CAS) in Lausanne and was a member of the CAS Ad Hoc Divisions during the London 2012 and PyeongChang 2018 Olympic Games. For many years, he was the Chairman of the Sports Law Commission of the Union Internationale des Avocats (UIA). Additionally, he is a member of the International Sport Lawyers Association and of the advisory board of the German Association for Sports Law (DVSR) as well as member of the executive committee of the sports law working group of the Deutschen Anwaltverein (DAV). He is also a member of the FISA Ethic Group, which he joined in 2015.

Further, he currently acts as the chief editor of the leading book for templates in sports law. He is also the author of the practice handbook 'Sportrecht' (Sports law) and co-editor of the leading commentary on the Law of Clubs and Associations ('Reichert – Vereins- und Verbandsrecht'). Moreover, he has published many articles on the legal issues surrounding sport. Last but not least he is a lecturer in sports law, sports management and labour law at the University of Bochum and the private university “Fresenius” in Cologne.