Siavash Beizai was born in Iran. He studied music at Tehran University. His piano teachers were Emanuel Melik-Aslanian and Pari Barkeshli. He also credits Mohammad Taqi Massoudieh as an important resource for his work. Beizai continued his studies in Detmold, Germany, where his teachers were Gieselher Klebe, Gyorgy Ligeti, Martin Christoph Redel, and Dirk Reith. The composers whose work has been of special interest for Beizai are Bach, Chopin, Ravel, Bartok, and Ligety.

Beizai’s numerous published collections of arrangements for piano of Persian folk-songs have recently been augmented by Tavallodi digar (Rebirth) for voice and piano, based on a poem by Forouq Farrokhzad; Mahtab, Nowrouzkhani, Sholeyl, and Concerto for Tonbak and Orchestra (all orchestral works); and Meydansalar for choir and symphony orchestra. He has written several books based on his research in the fields of Persian folk music and classical Persian music, including a two-volume treatise on Persian harmony. He has translated several internationally significant treatises on music into Persian, including articles by Béla Bartók (About the folk music) and Walter Piston’s Harmony. Beizai is currently working on treatises on harmony, orchestration, ear training, and counterpoint that will be more specific to Persian music than the Western treatises on these subjects. Also slated for publication in the near future are additional folk song arrangements for piano, folk songs for voice and piano, a cappella choral works, and chamber music.

Until 2008, Beizai taught at Tehran’s University of the Arts and Conservatory of Music. In the current political climate, he has withdrawn from public activity, preferring to focus on his composing, writing, and publishing activities.

Since 2008, he is living in Germany, writing his dissertation about the "Persian Music Theory and Harmony".