De la Rocha was also influential in re-establishing the traditional Mexican celebration of the Day of the Dead in Los Angeles.

The group, composed of Carlos Almaraz, Frank E. Romero, Gilbert "Magu" Luján, and de la Rocha,[3] was responsible for numerous murals and public art installations in the Los Angeles area.

According to Luján, he and de la Rocha emphasized "indigenous and local" aspects of Chicano art, while the other two members were more interested in the European tradition.

[5] According to Judithe Hernández, the first female member of Los Four, de la Rocha was also a "brilliant printmaker",[6] much whose imagery was drawn from "his [very fragile] mental state".

"[4] According to The American Prospect, he was also the art editor of the United Farm Workers publication El Malcriado.