"Diarmo" is a portmanteau of "Dibujos animados Arola y Moreno" (Spanish for "Arola and Moreno Animations").In 1948, he emigrated to Caracas, Venezuela and worked for the Venezuelan Ministry of Education on Tricolor, an educational children's magazine, as well as advertising spots.
Moreno returned to Spain in 1956.
He was known as one of the most prominent Spanish animators.