at UCLA Fowler Museum of Cultural History, the Oakland Museum of California, the Merced Multicultural Arts Center, the Crocker Art Museum, the Jersey City Museum, and Galería de la Raza; his art was in the opening show at the Kantor Gallery, and in the exhibition At Work: The Art of California Labor at Pico House gallery; a solo retrospective, More Than A Witness was at the A Shenere Velt Gallery, Los Angeles. He was included in the show Fundamental (addressing religious fundamentalism) in Manchester in 2007. Vallen was inspired to create Nuclear War?! There Goes My Career! after the election of Ronald Reagan in the fall of 1980. Still some years before Robbie Conal gained fame for his scathing caricatures of Reagan, Vallen's piece appealed not only to the aesthetics but the pragmatics of activism in Los Angeles. Vallen modeled his figure in part on Wonder Woman, and with its obvious nod to Lichtenstein’s pop art, his piece was both aesthetically familiar and initially non-threatening to the viewer. The deceptively brief text undercut the familiarity of the image with a deeply ironic commentary on the priorities of the average American citizen. It offered a grim view of American complacency in the face of the nuclear threat. Both Nuclear War?! There Goes My Career! (1980) — a front cover graphic for LA Weekly — and We're Number One (1984) were shown as part of the Yo! What Happened to Peace? traveling exhibition, whose venues included the Los Angeles Transport Gallery and the Parco Museum in Tokyo in 2005. Two of his prints, including Nuclear War?! There Goes My Career!, were included in an exhibition of political poster art at the Museum of Modern Art. Vallen's illustrative work includes Slash magazine, the LA Weekly, LA Reader, California Magazine, The Progressive, Mother Jones, and South End Press,. It has frequently been used for the cover of the Santa Monica Review. His art is in the book, Just Another Poster? Chicano Graphic Arts in California. He contributes art to the web site Xispas, which covers Chicano culture and is edited by the writer, Luis J. Rodriguez. Vallen designed the cover for Rodriguez's poetry book, My Nature Is Hunger, published in 2005. He lives in North Hollywood. Art philosophy He has commented on art: What I disparage is the postmodernist emphasis on form over content, or process over result — which has led to an