Boris Kosak was born in Byelorussia and grew up in Ukraine, at the Black Sea coast.
He learned to play the piano at the age of 6, later receiving lessons in guitar, violin and accordion. Firstly Kosak studied with Valentin Bibik at the Kharkiv Institute of the Arts (Ukraine).
After graduating with honours in composition and musicology, he moved to Cologne (Germany) to study composition with York Höller and electronic composition with Ulrich Humpert at the Kölner Musikhochschule.
He simultaneously studied English and French philology at the local university. In Cologne, Boris Kosak occupied himself intensively with different styles, eras, genres and art forms. He painted pictures, made short movies, performed as a salsa dancer, wrote fairy tales, and learned to program software.
Simultaneously, he discovered the Indian raga, the Russian liturgy, the Cuban rumba and salsa, hip-hop and Brazilian samba. He also played keyboard in a Brazilian samba band, wrote music for hip hop bands, radio plays, and produced meditation music.
All these different influences resulted in new very personal style. Some of the latest works of Boris Kosak are inspired by spiritual-mystical connections, among them the vocal suite Life cycle (with texts written himself), the symphonic poem Black Forest, and the cello concerto BarCellona concerto.