Who are Janis Elspas's most notable collaborators in the art world?

I do not have specific, reliable information about “Janis Elspas’s most notable collaborators in the art world” in the available material. Most of what I see focuses on Hollywood history, cemeteries, studios, and figures like Jim Henson, rather than named art-world collaborators connected directly to Janis Elspas.

Are you asking about collaborators in photography, historical tours, writing, or another specific medium?