In 1998, with the establishment of the first postgraduate course of music composition in Iran, having gained the first place in national university entrance exam he entered Tehran University of Art. Under supervision of Ahmad Pejman, he presented his master's thesis in music composition including a work of four movements based on Iranian melodies for the symphonic orchestra. Then he was a lecturer at the University of Arts in 2000 as he graduated.
Houman Dehlavi travelled to countries such as Austria, Slovakia, Canada, and the U.S. for further music experiences and collaborated with other musicians in composing, arrangement, recording and performances. He chose the U.S. and Iran to live in and by establishing an orchestra, he performed Iranian music in the United States. He also participated in National Festival of Youth Music and was a member of jury in University of Arts Music Festival.
Some of Houman Dehlavi's works:
- The book Three Pieces by Hosein Dehlavi, arrangement for piano by Houman Dehlavi
- The book Seven Skies, 18 pieces for piano
- Music album Days of Not Being, vocalist Salar Aghili
- Daaman Keshan (based on the melody of Saari Galin), vocalist Bijan Bijani
- Symphonic Movement, for symphonic orchestra
- Fantasy, for Qanun and Orchestra
- Dream of the plain, for ney, harp and string orchestra
- Arrangement and conducting Ragse Irani, composed by Mahin Zarinpanjeh
- Dream, for piano
- Lullabies, for piano
- Adobe and Alas
- Music for the play Without Farewell, directed by Katayoun Feyz Marandi
- Music for the play Notebook, directed by Katayoun Feyz Marandi
- Music for the play Window, directed by Jaleh MohammadAli