Miguel Astor-Aguilera is associate professor of religious studies at Arizona State University, USA. An anthropologist by training, his scholarship concentrates on material culture and socio-religious theory. He specializes in Mesoamerican ontology and cross-cultural personhood issues and his publications include "Comparing Indigenous Pilgrimage" (2008), "Latin American Indigenous Cosmovisions" (2016), and The Maya World of Communicating Objects (2010). His current research focuses on Maya ritual specialists in the Yucatan peninsula and their healing practices as related to their ecological behavioral environment.

Graham Harvey is professor of religious studies at The Open University, UK. His research and teaching largely concern the rituals and protocols through which various Indigenous people and Pagans engage with the larger than human world. His publications include Food, Sex and Strangers: Understanding Religion as Everyday Life (2013), The Handbook of Contemporary Animism (2013) and Animism: Respecting the Living World (2nd edition 2017). He is co-editor of the Routledge monograph series "Vitality of Indigenous Religions".