Exorcism
In Catholic practice the person performing the exorcism, known as an exorcist, is an ordained priest. The exorcist recites prayers according to the rubrics of the rite, and may make use of religious materials such as icons and sacramentals. The exorcist invokes God—specifically the Name of Jesus—as well as members of the Church Triumphant and the Archangel Michael to intervene with the exorcism. According to Catholic understanding, several weekly exorcisms over many years are sometimes required to expel a deeply entrenched demon.
Lewis Ashmore
Ashmore was a noted exorcist having performed hundreds of exorcisms since the 1950s. "For decades Rev. Lewis Ashmore cast out devils during tent revivals in the Central Valley. People foamed at the mouth, talked back to him in a strange voice and writhed uncontrollably on the ground." Aged 75, two years before he died, Ashmore concluded that demonic possession could be explained in the 21st century by modern medicine. "Back in Christ’s day, these mental conditions weren’t yet diagnosed,” he said. “All exorcisms can be explained by psychology and science."