Roger S. Wieck is the Melvin R. Seiden Curator and Department Head of Medieval and Renaissance Manuscripts at the Morgan Library & Museum in New York, where he oversees more than eleven hundred manuscripts, spanning some ten centuries of Western illumination. Previously, he held curatorial positions at the Walters Art Museum and the Houghton Library of Harvard University. Wieck has written numerous books including The Medieval Calendar: Locating Time in the Middle Ages (2017).