Argo Group International, an underwriter of specialty insurance and reinsurance products, has appointed Marsh Duncan as a senior vice president to head the environmental division of colony specialty.

Based in Georgia, Duncan will report to chief underwriting officer for the E&S Lines segment Michael Fleischer.

Duncan will bring over 14 years of environmental underwriting experience to this role. Most recently, he served as vice president for the environmental division of ACE Westchester.

At ACE Westchester, he was responsible for underwriting all classes of environmental risk including general liability, contractors pollution liability, professional liability, products pollution liability, excess liability and premises pollution coverage.

Before joining ACE, Duncan was a managing underwriter in the environmental division of Gulf Insurance.