Anthropology professor and noted local history expert, interested and peripherally involved in the Mohawk Indian occupation at Moss Lake, 1974-1980.

In May of 1974, a group of Mohawk Indians seized an abandoned girl's camp at Moss Lake, NY. The community, which became known as Ganienkeh (Land of the Flint) was established as a utopian community; a place where the traditional Mohawk people could live and practice their own government and religion. Throughout the first months of occupation of the land, the Mohawk and the surrounding community coexisted peacefully. However, in October of 1974 an incident occurred that altered the way in which the Ganienkeh settlement was perceived by public. Two civilians, a nine year old girl and a twenty-two year old man, received shotgun wounds in separate altercations. The Mohawk maintained that they were responding to gunfire directed at the settlement. When the New York State Police attempted to assert jurisdiction regarding the shootings, the Mohawk cited a Treaty signed in 1794, which maintained that local authorities had no jurisdiction.

With the increased tension between the settlement and the surrounding community because of the shootings, several groups organized in opposition to the settlement. In addition, a local newspaper editor was commissioned to investigate the validity of the Mohawk's land claims. Michael Blair extensively used the research files of Arthur Einhorn to compile his report. At the time, Einhorn was the head of the Department of Anthropology at Jefferson Community College in Watertown, NY. Generally regarded as an expert on Native Americans, Einhorn kept a low profile and usually insisted on remaining anonymous. When Blair acknowledged his assistance in compiling the report on the Mohawk's land claims, the section was later deleted from the final confidential report.

The Moss Lake controversy continued through the mid-1970s, until in 1977 Mohawk representatives and the State of New York came to an agreement. The Ganienkeh settlement agreed to move to a new site, located near Altona, New York, where it remains. Einhorn continued to insist on anonymity. When Gail Landsman, an anthropologist, began her Ph.D. dissertation research on the Moss Lake controversy in 1979, correspondence between the two indicates Einhorn was adamant that she not use his name as a source. Einhorn's intense interest in the Mohawk Indian's cause is strikingly apparent by the extensive amount of research material contained in the collection.