Jan Jansen > BAHR > Oslo, Norway > Lawyer Profile

0117 OSLO




Jan B. Jansen is head of BAHR’s Oil and Energy Group. He has been closely involved with the oil and gas sector in Norway since 1986, including as advisor in petroleum law cases and transactions, and as counsel in legal proceedings. Jansen has acted for some of the largest and most active companies on the Norwegian continental shelf, including Statoil, Shell, ExxonMobil, BP and TOTAL. He has also acted for the Norwegian State. Jansen has a thorough understanding of the oil and gas industry and the challenges faced by companies.


  • 1997 – Admitted to the Supreme Court
  • 1984 – Cand. jur, University of Oslo

Lawyer Rankings

Norway > Dispute resolution

(Hall of Fame)

Jan JansenBAHR

BAHR‘s dispute resolution department has solid expertise in commercial litigation, including shareholder disputes and contentious insolvency matters, and reports an increase in professional liability cases. Key sector strengths for the group include the insurance, offshore and onshore construction and oil industries. Atle Skaldebø-Rød heads up the group, and has a strong reputation in contractual disputes, directors’ liability matters and arbitration proceedings. Jan Jansen concentrates on the energy and offshore sectors and has significant expertise in tax litigation; Sam E. Harris focuses on onshore construction and post-M&A litigation, and is well known as an arbitrator; and Thomas K. Svensen specialises in energy sector litigation and arbitration. Of counsel Gunnar Sørlie is also noted.

Norway > Oil and gas

(Hall of Fame)

Jan JansenBAHR

BAHR is a key name in the oil and energy sector, with noted expertise in financing and transactional matters. Petroleum tax issues are another core strength of the practice; Jan Jansen is a highly regarded practitioner in this space, acting as counsel to a solid client base of prominent industry names including ExxonMobil and Shell. Managing partner and department co-head Thomas K. Svensen is regularly instructed in oil and gas-related dispute resolution, project development matters and regulatory work. Jon Christian Thaulow, who shares leadership of the practice with Svensen, has extensive experience in transactions and restructurings. Specialist partner Trond Lingaas is another key contact, and Eirik Høiby joined from Advokatfirmaet Selmer AS in 2020.

Norway > Tax

With an ‘excellent team‘ of ‘highly talented tax lawyers‘, BAHR‘s full-service department has been kept busy advising large oil companies on a range of transfer pricing issues, with tax litigation remaining a prominent area of instruction for the group. Practice head Joachim Bjerke garners praise for his ‘excellent insight into transfer pricing‘, and Jan Jansen is highly regarded as ‘one of the strongest tax litigators in Norway‘, which he combines with expertise in petroleum tax law. The practice is also noted for its solid experience working in tandem with the firm’s M&A team to provide advice on transactional work. Peter Hammerich and Camilla Jøtun primarily focus on private equity and asset management matters, Anne Sofie Bjørkholt is sought after for her expertise in real estate tax, and specialist partner Marius Pilgaard is a key individual.

Norway > Insurance

BAHR‘s team of ‘very good insurance lawyers‘ is led by oil and gas expert Jan Jansen, who handles D&O and professional indemnity claims for international insurers and is also well known for his expertise in litigation. Atle Skaldebø-Rød is ‘extremely sharp and quick on his feet, and a great litigator‘, with a solid track record in handling contentious marine insurance work. Tarjei Thorkildsen is also a key contact for marine insurance litigation, and acts as counsel to the Norwegian Hull Club on business interruption claims, reinsurance work, and ship and cargo damage cases. Senior associate Mads Schjølberg is a name to note.