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Sebastian advises and represents principals and contractors on all questions of construction and architects‘ law. A further focus lies in insolvency law. He is active both in and out of court. His activities include in particular the legal support of construction measures, the securing of claims as well as the enforcement of rights in the case of an (imminent) insolvency of a party involved. Moreover, he advises managing directors and shareholders in the financial crisis and on all matters of claw-back claims.

Curriculum vitae

  • Studied law at the University of Hamburg, 2011 to 2016
  • Research assistant at the Chair of Civil Law, General and Civil Procedure Law in Hamburg (Prof. Dr. Reinhard Bork) with research stay at University of Oxford (Harris Manchester College), 2016 to 2019
  • PhD in insolvency/contract law, 2016 to 2019
  • Legal clerkship in Hamburg and London, 2019 to 2021
  • Lawyer (Rechtsanwalt) at Kapellmann since 2021

Other qualifications and memberships

  • Lecturer at University of Hamburg, 2019 to 2022
  • Member of North German Insolvency Law Forum Hamburg e. V.


Books and book contributions

Zeyns, Die anhängige Widerklage im Forderungsfeststellungsverfahren gem. §§ 174 ff. InsO, ZRI 2022, 358-363

Zeyns, Der Bau- und Bauträgervertrag in der Doppelinsolvenz, ZRI 2022, 569-575

Zeyns, (Insolvenzrecht und Bauvertragsrecht): Das Kündigungsrecht des Bestellers in der Unternehmerinsolvenz, ZIP 2018, S. 8-15

Annotations on court decisions

Zeyns, Darlegung der Sicherungshöhe einer § 650f BGB-Bürgschaft im Falle eines beidseitig gekündigten Bauvertrages, Anmerkung zu OLG Stuttgart 10. Zivilsenat, Urteil vom 17.01.2023 - 10 U 91/22 jurisPR-PrivBauR 7/2023 Anm. 3

Zeyns, Zuständigkeit: Drittwiderklage gegen die Vertragserfüllungsbürgin, Anmerkung zu OLG Frankfurt 11. Zivilsenat, Beschluss vom 17.11.2022 - 11 SV 39/22, jurisPR-PrivBauR 3/2023 Anm. 1

Zeyns, Fristsetzung gemäß § 640 Abs. 2 BGB: Erneute Rüge bereits gerügter Mängel erforderlich?, Anmerkung zu OLG Schleswig 1. Zivilsenat, Urteil vom 10.12.2021 - 1 U 64/20, jurisPR-PrivBauR 10/2022 Anm. 3

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