Who is Sergei Eisenstein from Sculpting in Time: Reflections on the Cinema and what is their importance?

Eisenstein was a Russian filmmaker of the 1920s and 1930s who wrote extensively on film theory. Like other Russian theorists of his time, Eisenstein subscribed to the "montage" philosophy of cinema, in which the content of shots is less important than their juxtaposition (via editing). Tarkovsky believes editing is not the central element of cinema, but instead rhythm, which is found within shots, and not just between shots.