Ivan Ivarsson is a composer, producer, mixer, and mastering engineer from Sweden. His music spans ambient, neoclassical, electronic, and experimental genres, alongside artists such as Loscil, Ólafur Arnalds, and Jon Hopkins. Often drawing inspiration and sounds from the raw beauty of both nature and industrial environments.

He is the founder of Ovanbeck Recordings, one of two in Johnny & Buck, and plays drums, produces, and mixes for Heiko. He releases music under several monikers, including Sissy Ven, The Grey Duke, and Military Army.