Celebrating Sesame Street, by Tinsley, Jeffrey Wayne 1947-2017, 1989, Smithsonian Archives - History Div, Ellen Roney Hughes, curator of Social and Cultural History at the National Museum of American History, makes friends with Elmo, seen here on the counter of Mr. Hooper's store. The set, photos and other items from the enduringly popular show are on view in the exhibit "Sesame Street: The First 20 Years," located on the cafeteria level..