Skage has a master's degree in nature management from NMBU, and a BBA from the European University, Barcelona, and Tec de Monterrey, Mexico. He worked for several years in Handelsbanken Capital Markets, before starting the real estate company Fåvne Eiendom in 2010. From 2021, Skage has led Bellona’s partnership program, and is working to strengthen Bellona’s collaborations with the business sector.