The Leo Castelli Gallery opened in New York at 4 East 77th Street on February 10, 1957. Within 10 years, the gallery became the international epicenter for Pop, Minimal, and Conceptual Art, showing among others Jasper Johns, Robert Rauschenberg, Cy Twombly, Frank Stella, Roy Lichtenstein, Andy Warhol, James Rosenquist, Donald Judd, Dan Flavin, Robert Morris, Bruce Nauman, and Keith Sonnier. In 1971 the Castelli Gallery opened a second space at 420 West Broadway in SoHo. During this decade, several Conceptual artists joined the gallery, including Joseph Kosuth, Lawrence Weiner and Hanne Darboven. In 1999 the Leo Castelli Gallery moved to the Upper East Side, where it has since been located.