[1] Dennis considers his work as an exploration of "indigenous identity, cultural assimilation, and the ancestral traditional practices of my tribe, the Shinnecock Indian Nation."
His process involves staging theatrical scenarios that portray the legacy of colonialism in the United States, focusing on the repressed guilt "among White settlers and their descendants.
[4] A profile on the artist and his work in The New Yorker described his photographic series, On This Site–Indigenous Long Island, which depicts locations where "notorious historic incidents" took place as "quiet explorations of America’s intrinsic violence.
"[5] In 2021, Dennis founded Ma's House & BIPOC Art Studio, an artist-in-residence retreat and education center, on the Shinnecock Nation tribal lands in a house that belonged to his grandmother, Loretta A.
[6] In 2016 Dennis received a Dreamstarter grant from Running Strong for American Indian Youth to create his photographic project, On This Site – Indigenous Long Island.