Born in 1963, Hasegawa began his improvisation with his voice and percussion in the early 80s. In 1989 he formed the group C.C.C.C. whose concept was improvisational mass-noise with very loud sound. He began his solo unit ASTRO with analog synthesizers in 1993 as well as playing in C.C.C.C. and then he formed “Cosmic Coincidence” in 2010 with the members Manuel Knapp and Rohco. Since 2013 ASTRO consists of Hasegawa and Rohco as a duo project.
 Now he is actively playing and issuing and doing many collaborations with other artists. His playing style is like drifting between meditation and awakening state with electronics, and he is still pursuing it.







2013年に女性エレクトロニクス奏者RohcoをASTROのメンバーに迎えデュオ編成になったのを機に、ソロ名義を本名の「Hiroshi Hasegawa」とする。

なおメンバーとして参加しているユニットにはASTRO以外にも「Astral Traveling Unity」「Galactic Abyss」「Cosmic Coincidence」「Mortal Vision」「BLASTRO」「NORD」「GALAX」「SOUTH SATURN DELTA」等がある。