His areas of operation was Norway and Japan. He continued in Scandpower AS as senior consultant and department manager for Risk Management services. Later Rosenberg was employed in Norgas Carriers AS as Technical Manager for 18 gas carriers. During this period, he contributed to develop Norgas with several newbuildings and establishment of fleet management offices in Singapore and Shanghai. Rosenberg was founder and partner in charge of developing engineering company Bassoe Technology AB in Gothenburg. Rosenberg has over the last years been Project Manager for developing prototype of LNG carrier including construction and operation of the LNG carrier Saga Dawn for Saga LNG Ltd. Rosenberg has been Site Manager for conversion of two vessels for Hurtigruten AS from conventional vessels to hybrid vessels. He has experience as chairman and member of several Boards. Rosenberg has spent the last 25-30 years working with companies in Asia.