Oneirogen is an experimental solo project of Mario Diaz de León, a New York City-based composer and metal musician who teaches a music humanities course at Columbia University. His work as Oneirogen combines doom metal guitar riffs, dark ambient textures, and harsh noise bursts, creating an intense yet structured vortex of apocalyptic sound. He debuted the project in 2012 with the album Hypnos, originally released under his own name on the Shinkoyo label and subsequently given a limited vinyl release as Oneirogen on Denovali Records. The label also pressed a limited vinyl issue of Veni Nox Anima, an EP also released under the composer's own name as a cassette on Canadian label Los Discos Enfantasmes. The 2013 album Kiasma featured a more prominent usage of guitars than previous Oneirogen recordings, but its synth arpeggios and cinematic overtones set it apart from the typical doom metal release. Oneirogen's 2015 EP Plenitude moved away from the overt metal influences, placing a higher emphasis on screamed, distorted vocals and industrial percussion, coming closer to the power electronics genre. ~ Paul Simpson