Don W. Cruickshank, former Professor of Spanish at University College Dublin, is internationally known for his researches into 17th-century drama and early printing in Spain. His most important works include the facsimile edition of Calderón's Comedias, produced with J. E. Varey in 19 volumes, and his definitive biography of Don Pedro Calderón (2009). His death in 2021 was mourned worldwide as an irreparable loss to Golden Age Studies and to Hispanism.

Ann L. Mackenzie is Ivy McClelland Research Professor of Spanish (emeritus) and Honorary Professorial Research Fellow at Glasgow University, United Kingdom. A leading scholar of Spanish Golden-Age theatre and Editor-in-Chief of the Bulletin of Spanish Studies (founded 1923), she has published extensively on the dramas of Calderón and his contemporaries. Her groundbreaking studies include monographs on La escuela de Calderón: estudio y ensayos (1993) and Francisco de Rojas Zorrilla y Agustín Moreto: análisis (1994). She has edited and co-translated Calderón's plays, among them The Schism in England (La cisma de Inglaterra) (1990), has co-edited numerous special volumes and has contributed many articles to leading journals.