Christina Nielsen. Photo Michael Busack.

Boston's Isabella Stewart Gardner Museum has hired Christina Nielsen as curator of the collection and director of program planning. Nielsen succeeds Oliver Tostmann, who served as curator of the collection from 2011 to 2013, before becoming curator of European art at the Wadsworth Atheneum, Hartford, Conn. Nielsen has been assistant curator of late antique and Byzantine art at the Art Institute of Chicago since 2011. She takes up the new post in April.

Among the exhibitions Nielsen organized in Chicago were "Late Roman and Early Byzantine Treasures from the British Museum," "Caravaggio's Supper at Emmaus," and "The Silk Road and Beyond: Travel, Trade, and Transformation." Nielsen holds a PhD in art history from the University of Chicago.