While Yeniseian has been demonstrated to be related to the Na-Dene languages of North America, as part of a newly named Dene–Yeniseian family, the relevant morphological correspondences between Na-Dene and Yeniseian have not been found in Burushaski.
Contemporary supporters of Greenberg's theory, such as Merritt Ruhlen, have suggested that the Na-Dené language family represents a distinct migration of people from Asia to the New World.
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In February 2008 a proposal connecting Na-Dene (excluding Haida) to the Yeniseian languages of central Siberia into a Dené–Yeniseian family was published and well received by a number of linguists.
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He has become known for his work on the proposed Dené–Yeniseian language family, seeking to establish that the Ket language of Siberia has a common linguistic ancestor with the Na-Dené languages of North America.
Ket, or more precisely Yeniseian as a whole, has been linked in a proposal to the Na-Dené languages of North America.