I have a senior scientist position at the Norwegian Institute of Air Research (NILU). Currently my research focuses on the estimation of greenhouse gas emissions using atmospheric transport modelling and statistical optimisation. I received my PhD from Victoria University of Wellington in 2005 and held post-doc positions at the Max Planck Institute of Biogeochemistry (MPI-BGC), Jena, Germany and at the Laboratoire des Sciences du Climat et l'Environnment (LSCE), Gif sur Yvette, France,