Leviathan is an American black metal solo project that started in 1998 by Wrest (Jef Whitehead). In Leviathan, Wrest records and plays all instruments including vocals entirely on his own. Additionally, Wrest has collaborated with the band Sunn O))) and is an active member of the U.S. black metal supergroup Twilight. He has stated in interviews that he has been playing drums longer than any other instrument and that the drums are his instrument of choice. Wrest also plays and records everything in his other project Lurker Of Chalice. Regarding his writing, Wrest says that most of his lyrics are about suicide and that "Lyrics are important and also very hard for me... at times, the way things come out in words sounds like nonsense. I don't consider myself a poet by any means."

Despite having early problems with the release of Massive Conspiracy Against All Life, it was released March 24, 2008 in Europe and March 25, 2008 in North America. In late 2008, Wrest was arrested for drug possession in Thailand; the charges were later dropped.

Wrest's latest album, True Traitor, True Whore was released in November, 2011 on Profound Lore Records.