Daniel O'Sullivan (born 1 December 1980) is an English artist of Irish ancestry, multi-instrumentalist and composer from Manchester, England, best known for playing in experimental art-rock bands Grumbling Fur, Guapo, Miasma & the Carousel of Headless Horses, Ulver, Sunn O))), Æthenor, Laniakea, Miracle and Mothlite. He's also released solo work under his own name.