Born in Ankara in 1998, Doğaç İşbilen began his musical training as an oboist at Hacettepe University Ankara State Conservatory. He later studied composition and orchestral conducting there, building a practice that spans orchestral, chamber, vocal, electronic and interdisciplinary music.

His work has received first prizes at the 10th Dr. Nejat F. Eczacıbaşı National Composition Contest and the 1st Bisanthe Gülsin Onay National Composition Contest in 2018, and at the 3rd Süreyya Opera National Composition Contest in 2019. He received a second prize at Süreyya Opera in 2021. In 2022, his Piano Concerto was selected by the Martha Graham Dance Company for a choreography presented in İzmir.

After an Erasmus year at the Estonian Academy of Music and Theatre, he completed an MA in Composition and Music Technology there cum laude in 2024. He is now pursuing a PhD in Artistic Research in Music and Theatre at the same Academy, supervised by Toivo Tulev and Allan Vurma, and teaches sound theory, solfège and orchestration.

Since 9 November 2026, he has been an official member of the Estonian Composers Union (ECU).