Ned Rifkin is giving up directorship of the Hirshhorn Museum to concentrate on running the Smithsonian. Taking for the Hirshhorn is deputy director Olga Viso. “Viso, 38, a Florida native whose parents emigrated from Cuba, joined the museum’s curatorial department 10 years ago as an expert on contemporary Latin American art. She became curator of contemporary art five years later, and stepped up to the role of deputy director of the Hirshhorn in 2003. She previously worked for the High Museum of Art in Atlanta and Norton Museum of Art in West Palm Beach, Fla., and holds a master’s degree from Emory University.”