American artist Vija Celmins (b. 1938) is widely admired and respected for her sublime images of night skies and ocean waves. "Vija Celmins: Television and Disaster, 1964-1966" looks closely at Celmins' early work, which is deeply engaged with the Po...

Dieter Roth's unique and eclectic Tischmatten ("Table Mats") incorporate drawings, paintings, photographs, and ephemeral materials. Roth placed these grey cardboard mats on tables in his apartment, studios, and houses, collecting what he referred to...

Over the past decade, states and international organizations have shifted a surprising range of foreign policy functions to private contractors. But who is accountable when the employees of foreign private firms do violence or create harm? This timel...