Jan Martin-Jensen is co-owner at Inferno Metal Festival, where he manages the booking of the festival. The festival is one of the leading festivals for extreme Metal music in Europe. The festival, which is organized during Easter, runs for four days and stages around 45 bands. Besides his function at Inferno Metal Festival, Jan Martin-Jensen also promotes and books shows all year, through his company Radar Booking. Radar Booking has promoted and booked shows for international artists for 16 years. It is exclusively representing legendary Norwegian Black Metal pioneers MAYHEM in Scandinavia, and non- exclusively for the rest of the world.