Istvan Kantor (aka "Monty Cantsin", and "Amen!") (Hungarian: Kántor István; born August 27, 1949) is a Hungarian-born Canadian performance and video artist, industrial music and electropop singer, and one of the early members of Neoism.
In the 1970s, Kantor studied medicine, but also participated in the underground arts scene of communist Budapest that centered on the art historian László Beke. In 1976, at Art Club Budapest, he met the American prankster and Mail Artist David Zack, who was then touring through Europe with his mail-art collection. Zack encouraged Kantor to join him in America; Kantor emigrated via Paris to Montreal and, in 1978, lived one year with Zack and Blaster Al Ackerman in Portland, Oregon, encountering and working with artists from the Mail Art and industrial music scenes. He was one of a couple of persons to whom Zack suggested the idea of adopting the multiple identity Monty Cantsin, but only Kantor took this proposal seriously and adopted the Cantsin identity to the extent that it became chiefly associated with him. Returning to Montreal, he organized a Mail Art show, "The Brain in the Mail", and gathered together a group of people, many of them teenagers or in their early 20s, under the moniker of Neoism. Soon afterwards, Neoism expanded into an international subcultural network that collectively used the Monty Cantsin identity.