McShine, who organized a show that defined – and uplifted – Minimalism, and whose 1970 show “Information” at the Museum of Modern Art “set out to disturb the artistic and political status quo,” was a distinctive figure in the art world. “Especially in the 1980s and ’90s, Mr. McShine exercised a great deal of influence on what the Modern acquired in the way of postwar and more recent art, and applied a keen eye to its installation in the permanent-collection galleries.”