Bjorn Petter Jelle is a professor at the Norwegian University of Science and Technology (NTNU) and a chief scientist at SINTEF Building and Infrastructure. Jelle's background is as a physicist, chemist and material scientist, and examples of current work fields include building physics, materials science, solar radiation, thermal radiation, climate exposure, accelerated climate ageing, solar cells, building integrated photovoltaics, high performance thermal insulation materials, nano materials, and electrochromic materials for energy-efficient windows.