Ronald Bladen was a Canadian-born American painter and sculptor. He is particularly known for his large-scale sculptures. His artistic stance, was influenced by European Constructivism, American Hard-Edge Painting, and sculptors such as Isamu Noguchi and David Smith. Bladen in turn had stimulating effect on a circle of younger artists including Carl Andre, Donald Judd, Sol LeWitt and others, who repeatedly referred to him as one of the 'father figures' of Minimal Art.

Al Held was an American Abstract expressionist painter. He was particularly well known for his large scale Hard-edge paintings. As an artist, multiple stylistic changes occurred throughout his career, however, none of these occurred at the same time as any popular emerging style or acted against a particular art form. In the 1950s his style reflected the abstract expressionist tone and then transitioned to a geometric style in the 1960s. During the 1980s, there was a shift into painting that emphasized bright geometric space that's deepness reflected infinity. From 1963 to 1980 he was a professor of art at Yale University.