Cassils is a performance artist, body builder, and personal trainer from Montreal, Quebec, Canada now based in Los Angeles, California, United States. Their work uses the body in a sculptural fashion, integrating feminism, body art, and gay male aesthetics. Cassils is the recipient of a Guggenheim Fellowship, a Creative Capital Grant, a United States Artists Fellowship, a California Community Foundation Visual Artist Fellowship (2012), several Canada Council for the Arts grants, and the Rema Hort Mann Foundation Visual Arts Fellowship. Cassils is gender non-conforming, transmasculine, and goes by singular they pronouns.