Hiromi_Ishii2009studied composition in Tokyo, electroacoustic music at the Aufbaustudium (graduate course) of Musikhochschule Dresden with Wilfried Jentzsch. Having passed Konzert Examen with mark „eminent“, she further studied at City University London with supervision by Simon Emmerson and Denis Smalley where she was conferred her PhD degree. Her research, ‘composing electroacoustic music relating to Japanese traditional music’, was supported by an ORS Award Scheme scholarship of the UK. Her works have been invited and presented at music festivals such as CYNETart Festival Dresden, the Electroacoutic Music Festival Florida (granted by Japan Foundation), MusicAcoustica Beijing, EuCuE Canada, EMUfest Rome, Musica Viva Lisbon, Gaudeamus Netherland, the International Concert at Musiques&Recherches, International John Cage Festival Halberstadt, SoundTrack_Cologne8.0, Punto y Raya, NYCEMF, TIES Toronto and broadcast by the WDR, MDR, Radio Berlin and more. She was Composer in Residence at ZKM Karlsruhe in 2006(ZKM Grant), 2013, and 2016.

She is recently focusing on Multichannel 3D-Acousmatic composition, and Visual Music for which she composes both music and visual in parallel. As a curator she has been invited to curate concerts at various international festivals; Musica Viva, SoundTrack_Cologne, CYNETart, EMUfest, and so on.
As a lecturer she taught at Shobi University and Institute of Sound Technique in Japan. She is currently giving workshops and lectures worldwide in English, German and Japanese. Since 2008 she is living in Dueren, near from Cologne, Germany.