William McSherry was an American Catholic priest and Jesuit who became the president of Georgetown College and a Jesuit provincial superior. The son of Irish immigrants, McSherry was educated at Georgetown College, where he entered the Society of Jesus. As one of the first Americans to complete the traditional Jesuit course of training, he was sent to Rome to be educated for the priesthood. There, he made several discoveries of significant, forgotten holdings in the Jesuit archives, which improved historians' knowledge of the early European settling of Maryland and of the language of Indian tribes there.

Joseph Anton Lopez was a Mexican Catholic priest and Jesuit. Born in Michoacán, he studied canon law at the Colegio de San Nicolás and the Royal and Pontifical University of Mexico. He became acquainted with the future Empress consort Ana María Huarte and was made chaplain to the future imperial family. He was later put in charge of the education of all the princes in Mexico. Lopez was a close ally of Emperor Agustín de Iturbide, residing in Madrid for four years as his attorney and political informant, and accompanying him during his exile to Italy and England.