Alberto Magno Romero Rivera (September 19, 1935 – June 20, 1997) was an anti-Catholic religious activist who was the source of many of the conspiracy theories about the Vatican espoused by fundamentalist Christian author Jack Chick.Chick promised to promote Rivera's claims even after he died. Rivera claimed to have been a Jesuit before becoming a Fundamentalist Protestant, and many of the stories Chick published about Rivera involve Jesuit conspiracies.