Norden was known for his confrontational and volatile nature. He often worked 16-hour days and thought little of anyone who did not. Navy officers began to refer to him as "Old Man Dynamite". During development, the Navy suggested that Norden consider taking on a partner to handle the business and leave Norden free to develop on the engineering side. They recommended former Army colonel Theodore Barth, an engineer who had been in charge of gas mask production during World War I. The match-up was excellent, as Barth had the qualities Norden lacked: charm, diplomacy, and a head for business. The two became close friends.