Giuliana Cavallini, O.P., was the Director of the Centro Nazionale di Studi Cateriniani in Rome, as well as an editor of St. Catherine of Siena s dialogue and author of additional works on the saint. She purposefully wrote her biography of St. Martin de Porres as a story neither chronological nor critical. Rather, she gathered various episodes taken from the testimony given during the process of his beatification, from people who had known Martin in his lifetime. The completed work received the Imprimatur from Cletus F. O Donnell, and was originally published in 1963. Giuliana Cavallini is also the author of Things Visible and Invisible: Images in the Spirituality of St. Catherine of Siena.