Pedro M. P. Raposo, DPhil, is curator of the Adler’s Webster Institute for the History of Astronomy. He holds a doctorate in the History of Science from the University of Oxford. He has published on topics such as the history and heritage of nineteenth-century astronomy, the history of colonial observatories, and the circulation of knowledge in eighteenth-century Europe. Raposo is responsible for the use and research of the Adler Planetarium’s varied collections of historic scientific instruments, rare books, and works on paper.