Alex Katz, “Cut Outs: 1950s–1980s”

At 90, Katz is still going strong. If anything, his ineffable brand of Pop Art–inflected realism has only gotten better with time. Gavin Brown devotes both of his spaces to a look at Katz’s work, past and present, with a selection of new landscapes and portraits uptown plus his classic cut-outs from the ’60s through ’80s downtown.