Rafael Barrientos Martínez, formerly of the Kimbell Art Museum’s Paintings Conservation Department, is currently pursuing a Ph.D. in Mexican art at the University of California, Los Angeles. He co-authored the accompanying study on the print sources of Francisco de Zurbarán within Zurbarán: Jacob and His Twelve Sons, Paintings from Auckland Castle (2017, with Claire Barry). Previously, he has assisted with similar projects at the Kimbell regarding its permanent collection and exhibitions including those by Michelangelo and the brothers Le Nain.