Nicholas Turner, historiador de arte independente, foi anteriormente conservador adjunto do Departamento de Estampas e Desenhos do British Museum, em Londres, e curador de Desenhos no J. Paul Getty Museum, Los Angeles. Das suas numerosas publicações, fazem parte "The Paintings of Guercino: A Revised and Expanded Catalogue Raisonnée"; "From Michelangelo to Annibale Carracci: A Century of Italian Drawings from the Prado"; "European Master Drawings from Portuguese Collections"; "European Drawings in the J. Paul Getty Museum, 3: Catalogue of the Collections"; "Drawings by Guercino in British Collections"; "Florentine Drawings of the Sixteenth Century; and "Roman Baroque Drawings, c. 1620 to c. 1700, in the British Museum".(...)