 Along with director Zacharias Kunuk, he co-founded the first Inuit owned (75%) production company, Isuma and is the secretary-treasurer.In filming "Atanarjuat" in Igloolik, Cohn used natural light in shooting with his Sony DVW 700 digital camera, avoiding switches from the automatic camera settings.He also edited the film with Kunuk and Marie-Christine Sarda, sharing the Genie Award for Best Editing.