Poussin scholar and New York University professor of art history. Costello was raised in Brooklyn. She graduated from Erasmus Hall High School, Brooklyn, NY, and then Barnard College in 1940. She continued for graduate study at New York University's Institute of Fine Arts, writing her dissertation under Walter F. Friedländer in 1951. In 1952 joined the faculty at New York University teaching undergraduates at the Washington Square campus.

University of Chicago professor; French baroque art scholar. Dowley graduated Phi Beta Kappa from Princeton University in 1936. He entered the University of Chicago, initially studying philosophy, to which his 1941 A. M. thesis was devoted. During World War II he served as an ensign in the U.S. Navy. Between 1946-47 Dowley held a fellowship at the Institute of Fine Arts in New York, where he switched to art history, and, armed with a fellowship from the American Council of Learned Societies, researched 18th-century French portraiture in Paris 1947-49.

British author, illustrator, and polymath; wrote the first book in English on Poussin; early exponent of the so-called "Italian primitives". Graham was born Maria Dundas as the eldest of four children to Rear-Admiral George Dundas, and Ann Thompson (Dundas) at Papcastle near Cockermouth in Cumberland,UK present-day Papcastle, Allerdale, Cumbria, UK. She attended the school at the Manor House in Drayton, near Oxford, where she cultivated her interests in ​​learning botany, history, geography, English literature, and drawing.

Poussin and French art scholar. In 1907 he published a guide to the art museums of Munich. His Exzentrische Liebes- und Künstlergeschichten, is a fictional account of artists. He published the second volume of Barockmalerei in den romanischen Ländern, which the young art historian Nikolaus Bernard Leon Pevsner as issued the first. His book on Nicolas Poussin, published the same year as one by Walter F. Friedländer, largely overshadowed Friedländer's in Germany.