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Gudmundur Siemsen

Work +354 520 2050
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.


Dispute resolution

Within: Dispute resolution

The team at ADVEL Attorneys at Law, headed by Guðmundur Siemsen, is regarded for its ‘professional approach to coordination and management of cross-border disputes’. It is defending Kaupfelag Skagfirdinga before the District Court in alleged abuse of dominance proceedings. Kristinn Hallgrímsson represents convenience store 10-11 in a dispute concerning the trade mark ‘Inspired by Iceland’ valued at ISK950m. Clients also include Strætó, Vodafone and the Icelandic government.

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Maritime and transport

Within: Maritime and transport

The team at ADVEL Attorneys at Law advises HB Grandi in all aspects of its operations, including preparing and negotiating delivery contracts and in the purchase of four fishing vessels valued at approximately €132m. Clients of the practice, headed by Guðmundur Siemsen, include Samskip, Strætó and XL Airways France.

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Real estate and construction

Within: Leading individuals

GuĂ°mundur Siemsen - ADVEL Attorneys at Law

Within: Real estate and construction

The real estate and construction team at ADVEL Attorneys at Law represented Kolufell on the ISK7bn purchase of land in a premier location in ReykjavĂ­k harbour and will subsequently act for Mannvit Engineering in the construction of a hotel on the land. GuĂ°mundur Siemsen advises Mannvit on contracts and related documents for geothermal energy work in Ethiopia. Siemsen is the head of the practice following the departure of Telma HalldĂłrsdĂłttir to an in-house role. Clients also include Silicor Materials plc, Balcke-DĂźrr and Mannverk.

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