Justin Marler (born July 29, 1972)[citation needed] is an American musician.

He is known for being a founding member of the stoner rock band Sleep and for leaving a burgeoning career in music to become a monk in an Eastern Orthodox monastery.

[1] During his seven-year stint as a monk, he founded the widely distributed zine titled Death to the World.

The zine had a considerable impact on youth counterculture during the mid- to late-1990s,[2] which caught the attention of the mainstream press and quickly led to the release of Marler's first book, Youth of the Apocalypse, which he co-authored with a fellow monastic.

In 1999, Marler left his reclusive life in the monastery and returned to California where he restarted his music career, with former Sleep bandmate Chris Hakius, as the lead singer for an alternative band called The Sabians.