He went to Akwesasne where he worked with Rarihokwats and Ernie Benedict, helping to publish Akewsasne Notes, a local newspaper that ran from 1969-1996.
Posluns completed a PhD at York University in 2002 and his dissertation is titled The Public Emergence of the Vocabulary of First Nations Self-Government.
[2][3] He was the author of numerous other articles and books and he was co-author with George Manuel of 'The Fourth World: An Indian Reality' (1974) and with David Nahwegahbow and Douglas Sanders of 'The First Nations and the Crown: A Study in Trust Relationships' (1983).
[5] In speaking to The Globe and Mail in 2013 Posluns cited some of his early advocacy work in the 1970s involved changing the language the government used to refer to indigenous peoples.
[6] For example members of Canadian parliament would refer to activist Kahnitenata Horn as a "Mohawk princess," demonstrating an ignorance of the democratic governance structures of the Haudenosaunee Confederacy.