Seamus Ryan (better known by his stage name Esoteric) is a Boston-based underground hip-hop artist. Esoteric is 1/2 of the hip hop duo 7L & Esoteric, 1/3 of CZARFACE and he's also a prominent member of both underground hip-hop collectives Army of the Pharaohs & Demigodz. He started his solo career in 2007.