The eighty-seven works from the former collection of Karl Ströher, an industrialist of Darmstadt, form the core of the museum’s collection. Acquired by the city of Frankfurt in 1981‒82, they were a determining factor in the founding of the MMK. Ströher’s collection was in turn based on the former collection of the New York insurance broker Leon Kraushar. Most of the works date from the 1960s and represent the American Pop Art and Minimalist currents. They include workgroups by such artists as Carl Andre, Francis Bacon, Walter De Maria, Jim Dine, Dan Flavin, Jasper Johns, Donald Judd, Roy Lichtenstein, Claes Oldenburg, Robert Rauschenberg, James Rosenquist, George Segal, Frank Stella, Cy Twombly or Andy Warhol, as well as German artists of the period, among them Blinky Palermo, Gerhard Richter, Reiner Ruthenbeck and Franz Erhard Walther. When Karl Ströher was amassing his collection, his most important advisors were the gallery owners Franz Dahlem in Darmstadt and Heiner Friedrich in Munich.