He is widely recognised for his expertise across the entire spectrum of competition law.

One of his focus areas is competition litigation, where he regularly represents clients in disputes, e.g. in private damages actions and in the judicial review of decisions from competition authorities. He possesses a particular expertise in antitrust economics and his doctoral thesis (an economic approach to antitrust) relates to this topic. René regularly publishes articles on issues of competition law in journals and is a speaker on seminars on competition law. He co-heads the German Association of Antitrust Lawyers (Northern Chapter).