Father Andrei is a Russian Orthodox priest who sometimes met with Gabriel to inform him of activities within the church. In 1984, he meets with a disguised Philip to report on Father Viktor. ("IHOP") He performs a wedding ceremony for Philip and Elizabeth. ("Darkroom")
In November 1987, he is placed under surveillance by the FBI, leading to Philip narrowly avoiding capture. When he is brought in for questioning by Dennis Aderholt, he ultimately provides a description of the Jennings to a sketch artist. Dennis immediately recognizes Philip and Elizabeth.