Born in 1944 in the city of Kure in Hiroshima Prefecture. Graduated from the Tokyo National University of Fine Arts and Music in 1967, getting a graduate degree from the same school in 1959. Formed "Sound Space Arc" in 1972. Until its dissolution in 1990, that group performed concerts worldwide, including such venues as the Paris Autumn Festival, the London Almeda Festival, the New York Festival, and the Belgium Europaria '89.

In Japan, Koizumi has appeared regularly in such annual events as the Modern Music Exhibition and MUSIC TODAY under the direction of Toru Takemitsu.. Starting in October 1994, he gave ten concerts in the "Contemporary Japanese Flute Music Series." As one of Japan's contemporary musicians, he has given numerous world premieres and Japanese premieres to new works including solo pieces, chamber music and concertos by Toru Takemitsu, Joji Yuasa, Akira Mioshi and others. His performances span most of Japan's major orchestras, having appeared as soloist with the Sapporo Symphony Orchestra, the New Japan Philharmonic , the Nagoya Philharmonic Orchestra, the Orchestra Ensemble Kanazawa, the Kyoto Symphony Orchestra, the Osaka Philharmonic Orchestra, the Hiroshima Symphony Orchestra, the Kyushu Symphony Orchestra, and so forth.

Koizumi has also won such awards as the 1st Kenzo Nakajima Music Prize (1983) as a member of the ARC, the 7th Japan Gold Disc Prize (1993), the 2nd Asahi Contemporary Music Prize (1993), the 9th Japan Gold Disc Prize (1995), and the 15th Kenzo Nakajima Music Prize (1997). His CD, "Umi e(Toward the Sea)" (Nippon Shott), won the 1997 Record Academy Prize. He has also written a book entitled, "Contemporary Performance Techniques for Flute."

Koizumi serves as an instructor at both the Fukui Jin-ai Women's Junior College and the Toho Gakuen School of Music Junior College.



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