Otto Olsen was an excellent running target shooter, winning the single shot competition in the 1920 Games, and adding another gold as a member of the Norwegian running target team. Four years later he was also a member of the victorious Norwegian team at the Paris Olympics. He was also an excellent rifle shooter, winning gold medal in military rifle, prone at Antwerp in 1920. Olsen was also World Champion in the running deer double shot team competition in both 1929 at Stockholm and 1931 at Lwów, as well as silver medallist in the running deer single shot team event (1929, 1931), and silver medallist in the double shot individual (1929), making for a total of three golds and three silvers in World Championships. He was Nordic Champion in 1926, 1928 and 1936 and was awarded the King’s Cup as best Norwegian shooter in the 1929 and 1932 national championships. He is the Norwegian shooter with the highest number of Olympic medals, eight in total: four gold, three silver and one bronze. Olsen was from Oslo and worked as a cargo manager for the Norwegian Railway Company NSB.