On December 17, 1626, Urban VIII appointed him Bishop of Nueva Segovia. He was consecrated bishop in 1628 by Pedro de Arce, Bishop of Cebu. On January 9, 1634, Urban VIII appointed him Archbishop of Manila where he served until his death on July 1, 1641. While bishop, he was the Principal Consecrator of Diego Aduarte, Bishop of Nueva Segovia (1635).
- Gauchat, Patritius (Patrice) (1935). HIERARCHIA CATHOLICA MEDII ET RECENTIORIS AEVI Vol IV. Münster: Libraria Regensbergiana. pp. 261 and 230. (in Latin)
- "Archbishop Hernando Guerrero, O.S.A."Catholic-Hierarchy.org. David M. Cheney. Retrieved June 11, 2017
- "Metropolitan Archdiocese of Nueva Segovia" GCatholic.org. Gabriel Chow. Retrieved February 29, 2016
- "Archdiocese of Nueva Segovia". Catholic-Hierarchy.org. David M. Cheney. Retrieved 21 January 2015.