He's onscreen for only minutes. Tambor, who excels at acting stout stuffed shirts, inflames Pollock with a trifling comment. Critics are generally portrayed in the movies as parasites. But Harris gives Greenberg his due. In the end Greenberg has the guts to tell Pollock that he's losing his talent.
Few critics have the integrity to face down their targets without any consoling words.
There's a smaller role for Pollock's last lover, Ruth Kligman, played by Jennifer Connelly. I was sorry to see Harris relegating Connelly to the background. Harris considered the lissome Connelly, in her fetching array of bathing suits and summer clothes, less fascinating than the pain of a blocked, raging artist on the warpath. MUCH of the film is spent waiting for Mt. Pollock to blow up, though the lyrical moments hold your attention. Early in the film, Harden's Krasner lures Pollock into her bedroom.