Following the discovery of Stygium crystals on Aeten II, the Supreme Chancellor of the Republic appointed Duin to represent the world, knowing that the Sullustan was a dour man of few words who would be able to keep Aeten's secrets within the Republic.
Duin was often underestimated by his peers, who believed him to be a cynical bureaucrat. In truth, Duin was an insightful negotiator with a vast network of contacts. Duin was married and had two children.
There are several phrases written in Aurebesh on his biography page at the official site. When translated, they read: "Escaping the Fortitude", "Hunted by Lord Kyrus", "Rift Alliance".