Between the years of 1964 and 1973, he directed various orchestras until he became music director of the Boston Symphony Orchestra in 1973. His tenure at the BSO was maintained for 29 years, the longest tenure of any music director, surpassing the 25 years held by Serge Koussevitzky.[5] Ozawa won his first Emmy Award in 1976, for the Boston Symphony Orchestra's PBS television series, "Evening at Symphony." In 1994, the BSO dedicated its new Tanglewood concert hall "Seiji Ozawa Hall" in honor of his 20th season with the orchestra. In 1994, he was awarded his second Emmy for Individual Achievement in Cultural Programming for "Dvořák in Prague: A Celebration."[5]
An effort to merge all-Japanese orchestras and performers with international artists, Ozawa, along with Kazuyoshi Akiyama, founded the Saito Kinen Orchestra in 1992. Since its creation, the orchestra has gained a prominent position in the international music community.[2] In the same year, he also made his debut with the Metropolitan Opera in New York. He has additionally conducted the Berlin Philharmonic and Vienna Philharmonic on a regular basis. Ozawa can be seen in concert with the New Japan Philharmonic, the London Symphony, the Orchestre National de France, La Scala in Milan and the Vienna State Opera.
Ozawa caused controversy in 1996/97 with sudden demands for change at the Tanglewood Music Center, which caused Gilbert Kalish and Leon Fleisher to resign in protest.[7] Ozawa left the position in 2002.[8]