Mr Gudmundur Siemsen > ADVEL Attorneys at Law > Reykjavik, Iceland > Lawyer Profile

ADVEL Attorneys at Law

Work Department

Litigation, construction law, public procurement and tendering, employment and labour law, administrative law, real estate and property law.


Mr. Siemsen has extensive experience in litigation, in particular disputes concerning landmarks, planning and construction before the courts and at the administrative level. He is a prominent expert in property law and public procurement. Mr. Siemsen is a Partner and leads the dispute resolution division at ADVEL.


2006 to present ADVEL Attorneys (Partner). 2003 – 2006 Legal officer at Kópavogur Sheriff’s Office.


Icelandic, English


Icelandic Bar Association. Globalaw


Admitted to the Bar in 2006. Law degree (cand.iur) from University of Iceland in 2003. Attended Rhodes Academy for Oceans Law and Policy in 2002.

Lawyer Rankings

Iceland > Real estate and construction

(Leading individuals)

Guðmundur SiemsenADVEL Attorneys at Law

ADVEL Attorneys at Law counts domestic and international companies across the real estate and energy sectors, including Mannvit Engineering and Kolufell, on its key roster of clients. The team successfully represented real estate developer Reitir before the appeals court in a case involving the correction of an encumbrance error by the public registrar, regarding a property in Hallarmuli, Reykjavik. Gudmundur Siemsen leads the practice and is noted for his experience in projects and disputes relating to landmarks, contractor issues, planning and construction cases, and public procurement work.

Iceland > Dispute resolution

ADVEL Attorneys at Law has experience representing a roster of domestic and international clients in high-end disputes before the district, EU and EFTA courts, and is noted for its experience in handling cases involving major financial institutions. Key clients include the Icelandic Government and Vodafone; the team is representing the latter in an appeal to the EFTA Court regarding a state aid decision adopted by the EFTA Surveillance Authority. Guðmundur Siemsen leads the group and is supported by EEA and EU law specialist Dóra Sif Tynes. Kristinn Hallgrímsson left the firm in 2021 to join Arta.

Iceland > Employment

ADVEL Attorneys at Law handles a range of employment and labour law matters, often involving a cross-border element, including redundancies, transfer of employee issues share options plans. The team counts Icelandic companies across the energy, banking, fishing and IT sectors, as well as public authorities, on its key roster of clients. Following the departure of Óskar Norðmann in February 2021 to Arta, Stefan Thor Ingimarsson leads the practice group and is supported by Guðmundur Siemsen.

Iceland > Restructuring and insolvency

ADVEL Attorneys at Law handles company reorganisations, distressed funding issues and financial restructuring matters, in addition to bankruptcy proceedings, and acts a key adviser to Arion Bank. The team also counts Festi and leading Nordic IT company Advania on its key roster of clients. Litigator Guðmundur Siemsen jointly leads the practice group alongside attorney-at-law Svanhildur Anna Magnúsdóttir.