In 1965 Ostrowsky was appointed music director and conductor of the "Kol Israel Radio Choir" in Jerusalem. In 1966 he received a scholarship from the America-Israel Cultural Foundation which allowed him to study with the renowned Professor Hans Swarowsky at the Academy of Music and Performing Arts in Vienna. While studying in Vienna his talent was recognized by his teachers which permitted him to complete a four-year program in just two years, in 1968.
In 1965 Ostrowsky became music director and conductor of the "Kol Israel Radio Choir" in Jerusalem. In 1966 he received a scholarship from the America-Israel Cultural Foundation to study with Professor Hans Swarowsky at the Academy of Music and Performing Arts in Vienna. During his studies in Vienna, his talent was recognized by his teachers, allowing him to complete a four-year program in just two years, in 1968.