Marc, a partner at the firm, is widely recognized for his comprehensive technical expertise across all facets of patent law, with a particular emphasis on complex, high-stakes patent litigation. Throughout his career, Marc has represented many of the world’s leading technology companies, successfully guiding clients through a vast array of cross-border disputes within Europe and beyond. His litigation portfolio spans telecommunications, consumer electronics, automotive engineering, medical devices, chemical products, and pharmaceuticals, reflecting both the breadth and depth of his practice.

Marc’s litigation credentials are distinguished by his involvement in landmark matters concerning products ranging from laser toner cartridges and prosthetic heart valves to tele-health medical solutions, lorry brakes, smartphones, graphical user interfaces, LED lighting, and chemical compounds. Notably, for over a decade, he has played a pivotal role in litigation concerning laser toner cartridges and printer consumables, particularly with respect to the exhaustion of patent rights.

Over the past couple of years, Marc has developed significant experience in pan-European litigation under the Unified Patent Court (UPC) regime. He has served as lead counsel in numerous high-profile UPC enforcement campaigns, prevailing before various UPC divisions of the UPC, including securing victories at the Court of Appeal in cases of seminal importance. He has been directly involved in nearly every variety of UPC proceedings, ranging from applications for provisional measures, enforcement and penalty proceedings, to complex revocation actions and multifaceted infringement proceedings, often coordinating parallel actions across multiple jurisdictions including German national actions.

Beyond patent infringement, Marc has amassed particular expertise in FRAND licensing and standard-essential patent (SEP) disputes, including their significant competition law dimensions. He has also gained deep knowledge of the enforcement of software patents, having successfully established new jurisprudence concerning the territorial reach of software-related claims, recently achieving a landmark decision on behalf of a plaintiff in this fast-evolving area.

Marc possesses a broad transatlantic perspective, regularly collaborating with colleagues across Europe and the United States to ensure seamless and unified litigation strategies. Prior to joining Peterreins Schley in September 2022, Marc was a partner at the international law firm Bird & Bird in Munich.

Marc holds law degrees from the University of Münster, including a Ph.D. in international law and an LL.M. in intellectual property law. He is also certified as a specialist IP attorney (“Fachanwalt für Gewerblichen Rechtsschutz”), underscoring his depth of technical and legal proficiency.

A thought leader in his field, Marc is a frequent lecturer on patent law issues and has been invited to speak before various intellectual property organizations (including GRUR and VPP). Marc’s expertise, especially in the electronics and mechanics sectors, was recognized by The Legal 500 in 2022, where he was touted as an expert for electronics and mechanics. JUVE PATENTS recognized Marc in its 2025 UPC firm rankings as an "outstanding and entrepreneurial thinker," and in its 2026 UPC firm rankings as "excellent in telecoms”.

Marc has lectured on patent law at various conferences and upon invitation of IP associations (GRUR, VPP etc.), and has been invited to speak on panels with, among others, the presiding judge of the German Federal Court of Justice and the presiding judge of the Düsseldorf Court of Appeal.

Marc has been touted as an expert for electronics and mechanics by “The Legal 500” in 2022.

EXPERIENCE INCLUDES

• Represented a U.S. medical device manufacturer specializing in insulin patch pumps in Unified Patent Court (UPC) proceedings against a competitor, achieving a significant victory before the UPC Court of Appeal. Also managed German litigation against additional competitors, including main actions, damages determination, and enforcement proceedings.
• Representing world-leading manufacturer of 3D pens in multiple patent disputes against competitors and securing several preliminary injunctions in various enforcement campaigns.
• Represented a US medical technology company in a case against a competitor over an online vision test, securing a landmark decision clarifying the scope of the territoriality principle in patent law.
• Represented an international Japanese corporation in enforcing patents related to laser toner and printer technology against aftermarket manufacturers. Served as part of a legal team that secured landmark rulings on the issue of patent exhaustion, including decisions before the German Federal Supreme Court.
• Prepared "freedom-to-operate" opinions for one of the world's leading companies in the chemical industry.
• Represented a leading U.S. medical device manufacturer against competitors in multiple patent disputes over prosthetic heart valves and assisted in aligning multinational offense and defense strategies.
• Represented clients in mobile communications and audio/video coding cases, including intricacies of the co-called FRAND defense.
• Represented a client in the enforcement of a patent against an international automobile manufacturer concerning a neck heater for cabriolets. The dispute concluded with a landmark ruling on "equivalence" before the German Federal Court of Justice for the client.
• Represented a Japanese automotive supplier in several patent infringement proceedings relating to windshield wiper drives, including participation in parallel nullity proceedings.
• Represented a U.S. automotive components manufacturer in patent infringement litigation against a competitor involving truck brake technology.
• Represented U.S. clients in enforcement campaigns involving multiple patents against various Chinese and U.S. smartphone manufacturers.
• Representation of leading manufacturer of racing bicycles in various patent disputes.

PUBLICATIONS

• 1. „Forum Shopping mit amerikanischen Gerichten“ (Forum shopping with american courts), Schüling Verlag, Münster (2008).
• 2. „Die beschränkte Anspruchsfassung im Verletzungsverfahren“ (Claim limitation in infringement proceedings), Mitteilungen der deutschen Patentanwälte 2010, p. 549 et seqq.
• 3. „Der Besichtigungsanspruch bei Verletzung von Geheimhaltungspflichten“ (Inspection claims in case of infringement of confidentiality obligations), in: Praxishandbuch internationaler Know-how-Schutz – 2nd ed., December 2010, (publisher: Wurzer/Kaiser) – co-authored with Dr. Jochen Herr.
• 4. „Schwerer Rückschlag für die europäische Patentgerichtsbarkeit“ (Mayor setback for the European patent jurisdiction), Europäische Zeitschrift für Wirtschaftsrecht (EuZW) 2011, p. 321 et seqq. – co-authored with Dr. Jochen Herr.
• 5. „Speedy patent infringement proceedings in Germany: pros and cons of the go-to courts“, Journal of Intellectual Property Law & Practice, 2012, Vol. 7, No. 1, p. 44 et seqq. – co-authored with Dr. Jochen Herr.
• 6. „Der kartellrechtliche Zwangslizenzeinwand – Muss das Lizenzangebot einen Kündigungsvorbehalt für den Fall enthalten, dass der Lizenzsucher das Klagepatent angreift?“ (The antitrust compulsory license objection - Must the license offer contain a termination provision in the event that the license applicant attacks the plaintiff's patent?), Mitteilungen der deutschen Patentanwälte 2011, p. 492 et seqq.
• 7. „Kosten einer Ausweichtechnik als Vollstreckungsschaden?“ (Costs of a workaround as enforcement damage?), Mitteilungen der deutschen Patentanwälte 2013, p. 530 et seqq.
• 8. „Hat der Stoffschutz Löcher?“ (Does the protection of substances has exemptions?), GRUR 2015, p. 35 et seqq. – co-authored with Dr. Thomas Kühnen.
• 9. Urteilsanmerkung zum BGH-Urteil „Wärmetauscher“ (decision of May 10, 2016 – X ZR 114/13) (Annotation to the Federal Supreme Court’s decision „heat exchanger“), Mitteilungen der deutschen Patentanwälte 2016, p. 446 et seqq. – co-authored with Boris Kreye and Jochen Kamlah.
• 10. „Die Reichweite der Registervermutung bei nicht beurkundeten Zwischenerwerben im Patentrecht“ (The scope of the presumption of the patent register in the case of non-certificated interim acquisitions in patent law), GRUR 2016, p. 1126 et seqq.
• 11. „Vorbereitung und Durchführung eines Patentverletzungsverfahrens: Strategie und Haftungsrisiken (Teil 1)“, (Preparing and conducting patent infringement proceedings – strategy and risks (part 1)), GRUR-Prax 2018, p. 513 et seqq. – co-authored with Thomas Kühnen.
• 12. „Vorbereitung und Durchführung eines Patentverletzungsverfahrens: Strategie und Haftungsrisiken (Teil 2)“ (Preparing and conducting patent infringement proceedings – strategy and risks (part 2)), GRUR-Prax 2018, p. 544 et seqq. – co-authored with Dr. Thomas Kühnen.
• 13. „Vorbereitung und Durchführung eines Patentverletzungsverfahrens: Strategie und Haftungsrisiken (Teil 3)“ (Preparing and conducting patent infringement proceedings – strategy and risks (part 3)), GRUR-Prax 2018, p. 569 et seqq. – co-authored with Thomas Kühnen.
• 14. Rezension „Kühnen, Handbuch der Patentverletzung, 11. Aufl.“ (Evaluation of „Kühnen, handbook of patent infringement, 11th ed.“), Mitteilungen der deutschen Patentanwälte 2019, p. 96.
• 15. Comments on the decision of the Court of Appeals Munich, decision of December 12, 2019 - 6 U 5042/19 ("Confirmation of a temporary injunction in the dispute about an Anti-Anti-Suit Injunction"), GRUR-Prax, 2020, p. 47.
• 16. Aktuelle Rechtsprechung der Landgerichte und Oberlandesgerichte in Patentverletzungsverfahren („Current case law of the District Courts and the Courts of Appeal in patent infringement cases”), VPP Rundbrief 2020 (Nr. 4), S. 115 ff.
• 17. Anmerkung zum BGH-Beschluss „Gruppierungssystem“ (Annotation to the Federal Supreme Court’s order „grouping system”) (court order of February 23, 2021 – X ZB 1/18 (BPatG), GRUR-RS 2021, 11838.
• 18. Anmerkung zum BGH-Urteil „Bediengerät für Spiele“ (Annotation to the Federal Supreme Court decision „control unit for games”) (decision of August 03, 2021 – X ZR 71/19), GRUR-Prax, 2021, 635.
• 19. Anmerkung zum BGH-Urteil “Abgrenzung eines Merkmals des Patentanspruchs von einer in der Beschreibung ausgeführten Entgegenhaltung”Claim limitation based on prior art” (decision of April 04, 2022 – X ZR 71/19)
• 20. Anmerkungen zum OLG Düsseldorf Urteil „gewünschter Zeitschlitz“ („desired timeslot“) (decision of April 20, 2023 – 2 U 78/18), GRUR-RS 2023, 9638.
• 21. Festschriftbeitrag für Prof. Dr. Kühnen „Der Verschuldensmaßstab bei der Klagekonzentration“ („The degree of culpability and the concentration principle“)

PRESENTATIONS

• 22. „Die Reichweite der Registervermutung bei nicht beurkundeten Zwischenerwerben im Patentrecht“ (The scope of the presumption of the register in the case of non-certificated interim acquisitions in patent law), Haus der Universität Düsseldorf, November 25, 2015.
• 23. „Die Reichweite der Registervermutung im Patentrecht nach ‚Fräsverfahren‘“ (The scope of the presumption of the register in patent law after ‚milling method‘), GRUR-Bezirksgruppe Bayern, Munich, April 28, 2016.
• 24. „Aktuelle Fragen bei einstweiligen Verfügungen im Patentrecht“ (Current issues re preliminary injunctions in patent law), 30th Freiberger Seminar zu ‚Praxis des Gewerblichen Rechtsschutzes‘, Freiberg, June 23, 2016.
• 25. „Aktuelle Fragen bei einstweiligen Verfügungen im Patentrecht“ (Current questions re preliminary injunctions in patent law), VPP-Bezirksgruppe Mitte West, Cologne, September 22, 2016.
• 26. „Erschöpfung des Patentrechts im Zusammenhang mit dem Besonderen Mechanismus – Anwendungsbeispiele und aktuelle Rechtsprechung“ (Exhaustion of patent law in the context of the Special Mechanism - examples and current case law), VPP-Bezirksgruppe Mitte-Süd, Darmstadt, October 11, 2016.
• 27. „Vorbereitung und Durchführung eines Patentverletzungsverfahrens – Strategien und Haftungsrisiken“ (Preparing and conducting patent infringement proceedings – strategy and risks), VPP-Bezirksgruppe Süd-Ost, Erlangen, April 11, 2018.
• 28. „Vorbereitung und Durchführung eines Patentverletzungsverfahrens – Strategien und Haftungsrisiken“ (Preparing and conducting patent infringement proceedings – strategy and risks), VPP-Bezirksgruppe Nord-Ost, Berlin, May 14, 2018.
• 29. „Vorbereitung und Durchführung eines Patentverletzungsverfahrens – Strategien und Haftungsrisiken“ (Preparing and conducting patent infringement proceedings – strategy and risks, VPP-Bezirksgruppe Mitte, Kronberg, August 28, 2018.
• 30. „Seminar zum Patentverletzungsverfahren“ (Seminar on patent infringement proceedings), VPP-Bezirksgruppe Mitte-Süd, Ludwigshafen, March 20, 2019.
• 31. „Aktuelle Rechtsprechung der Landgerichte und Oberlandesgerichte in Patentverletzungsverfahren“ (Recent case law of the District Courts and Courts of Appeals in patent infringement proceedings), VPP-Bezirksgruppe Mitte (online event), November 10, 2020.
• 32. „Durchsetzung von Verfahrensansprüchen mit teilweisem Auslandsbezug“ (Enforcement of method claims when specific features are fulfilled abroad), VPP-Bezirksgruppe Mitte-Süd (online event), December 08, 2020.
• 33. „Preparing and conducting patent infringement proceedings in Germany – strategy and liability risks”, Webinar of EIRMA - European Industrial Research Management Association, June 02, 2021.
• 34. “Unitary Patent System and Unified Patent Court are Coming in 2022”, Webinar of EIRMA - European Industrial Research Management Association, April 07, 2022.
• 35. “Unified Patent Court – How Should Chinese Companies Respond?” –Seminar at Bavaria Business Auditorium, May 25, 2022.
• 36. „Aktuelle Rechtsprechung der Verletzungs- und Rechtsbestandsinstanzen in Patentsachen“ (Recent case law of patent courts in infringement and invalidity proceedings), VPP-Bezirksgruppe Mitte-Süd (online event), December 6, 2022.
• 37. „Prozessstrategien im Patentverletzungsverfahren im Ersatz- und Verschleißteilgeschäft“ (Litigation strategies in patent infringement proceedings in the spare and wear parts business), VPP-Bezirksgruppe Süd-Ost, June 21, 2023.
• 38. „Aktuelle Rechtsprechung des Unified Patent Court in Verletzungs- und Rechtsbestandsthemen“ (Recent case law of the Unified Patent Court of infringement and validity issues), VPP-Bezirksgruppe Mitte-Ost, March 26, 2026.