<P> Sewell Avery, another businessman, had supported the museum within the Commercial Club and was selected as its first president of the board of directors . The museum conducted a nationwide search for the first director . MSI's Board of Directors selected Waldemar Kaempffert, then the science editor of The New York Times, because he shared Rosenwald's vision . </P> <P> He assembled the museum's curatorial staff and directed the organization and construction of the exhibits . In order to prepare the museum, Kaempffert and his staff visited the Deutsches Museum in Munich, the Science Museum in Kensington, and the Technical Museum in Vienna, all of which served as models . Kaempffert was instrumental in developing close ties with the science departments of the University of Chicago, which supplied much of the scholarship for the exhibits . Kaempffert resigned in early 1931 amid growing disputes with the second president of the board of directors; they disagreed over the objectivity and neutrality of the exhibits and Kaempffert's management of the staff . </P> <P> The new Museum of Science and Industry opened to the public in three stages between 1933 and 1940 . The first opening ceremony took place during the Century of Progress Exposition . Two of the museum's presidents, a number of curators and other staff members, and exhibits came to MSI from the Century of Progress event . </P> <P> For years, visitors entered the museum through its original main entrance, but that entrance became no longer large enough to handle an increasing volume of visitors . The newer main entrance is a structure detached from the main museum building, through which visitors descend into an underground area and re-ascend into the main building, similar to the Louvre Pyramid . </P>

When did the museum of science and industry open
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