The phrase "high priest" refers to a person who holds a respected and important position in a religious group. They often have authority, lead religious ceremonies, and are seen as a spiritual leader. Full definition
Government is increasingly shaped by criteria of efficiency established by the great high priest of that value, the modern social scientist. (firstthings.com)
Nevertheless, understandably, many economists have enjoyed their new status as high priests and theologians of the new order. (religion-online.org)