Marjorie E. "Betsy" Wieseman was curator and head of northern European paintings at the National Gallery of Art from 2019 to 2025, during which time she was responsible for overseeing one of the most important collections northern baroque and northern Renaissance painting in this area outside the Netherlands. Most recently, she was part of the cross-departmental research team that organized the Vermeer’s Secrets exhibition (2022).

Wieseman is a renowned specialist in 17th-century Netherlandish art with an emphasis on Dutch portraiture and genre painting and the work of Peter Paul Rubens. She has also written about portrait miniatures, the technical examination of paintings, and the history of collecting, among other subjects. She was previously the chair of European art from classical antiquity to 1800 and curator of European paintings and sculpture 1500–1800 at the Cleveland Museum of Art. She has also held curatorial positions at the Museum of Fine Arts, Boston, the Allen Memorial Art Museum, Oberlin College, and the Cincinnati Art Museum. Weiseman also worked for the National Gallery, London, for 11 years as curator of Dutch painting 1600–1800 (2006–2012) and as curator of Dutch and Flemish painting 1600–1800 (2012–2017).  

Wieseman holds a PhD from Columbia University and an MA and BA from the University of Delaware.