Along with Wayne Static, Campos was the only other band member that had been a constant figure through the different Static-X lineup changes. Campos backed up with growling bowel vocals, and he sung the entire song "Anything But This" live. He performs vocals and bass for Asesino. He also joined Ministry after bassist Paul Raven died.
In 2001, Campos suffered a motorcycle accident, resulting in a broken collarbone, which caused him to miss most of the ongoing Static-X tour. He was temporarily replaced with Marty O'Brien. His stage name, "Maldito X", is Spanish for "Damned X".
In 2011, he joined the death metal band, Possessed, until 2012. He played with Possessed in 2013 at The Oakland Metro. He also joined Soulfly in 2011 as the official bass player. In May 2015, Campos announced his departure from Soulfly, and that he would be joining Fear Factory as their bassist.