In January, David Zwirner’s 519 W. 19th St location housed one of the most expensive to install and popular site-specific artworks ever shown there. Just seven months later, this prime real estate has been turned over to gallery employees (who happen to also be artists) for the group show, ‘People Who Work Here.’ A few participants might want to keep their day jobs, but among the standouts is this oil on wood portrait of Thomas Jefferson by David Ording titled, ‘Melanin.’ Based on a freckle-free 1805 original, the painting repatriates Jefferson’s pigmentation…perhaps at the expense of his dignity? (Through Aug 10th).