• 2016–2017

    Arbitration case

    Part of the team who assisted an E&P company in an arbitration case against a contractor regarding termination of a platform under construction.

  • 2013

    Transaction between OMV and Statoil

    Tonje acted for OMV in its acquisition of the fields Gullfaks and Gudrun on the NCS and Schiehallion and Rosebank on the UKCS from Statoil, with a transaction value of USD 2.65 billion.

Work experience

  • 2014–
    Thommessen, Oslo office, Senior Associate
  • 2013–
    External Examiner, Faculty of Law, University of Oslo
  • 2013
    Admitted to the bar
  • 2012–2012
    Consultant, Legal Department, Centrica Energi
  • 2012–
    External Examiner, Faculty of Law, University of Bergen
  • 2010–2013
    Thommessen, Oslo office, Associate
  • 2010–2010
    Trainee , Royal Norwegian Embassy in Tokyo
  • 2009–2010
    Research Assistant, Scandinavian Institute of Maritime Law, University of Oslo


  • 2004–2009
    Master of Laws, University of Oslo


  • MarIus no 392: "Third Party Access to transportation and storage facilities for CO2 – implementation of the directive on geological storage of CO2 of the European Parliament and of the Council into Norwegian law"