Hal Mehaffey founded Mehaffey Consulting in 1992 after eight years as the Band Manager of the First Nation of Nacho Nyak Dun in Mayo, Yukon. Hal specializes in the negotiation of land claim and Self-Government Agreements, implementation plans and financial transfer agreements. He represented the First Nation of Nacho Nyak Dun in their negotiations and, in 1995, the First Nation went on to become one of the first four in the Yukon to put its Final and Self-Government Agreement into effect. Since then, Hal has negotiated for other First Nations including the Selkirk First Nation, the Little Salmon/Carmacks First Nation and the Tlicho Government in the Northwest Territories.