| 1941 | Born in Hokkaido Prefecture |
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| 1964 | Faculty of Literature, Keio University |
| 1992 to 2004.3 | Director, The Museum of Modern Art, Kamakura & Hayama |
| 2004 to 2024.3 | Director, Setagaya Art Museum |
| 1996 | Curator, Bienal de Sao Paulo Special Exhibition |
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A collection of contemporary sculpture critiques written by Mr. Sakai includes the “Garden of Sculpture,” “Spirit of Tree,” “Law of Forest,” ”Ties of Sculptures” (published by Ozawa Shoten), “The Letter to a Sculptor”, “Interaction with the Sculptor”(published by Michitani) and “Isamu Wakabayashi, a Sculptor who Became a Dog” (published by Misuzu Shobo),etc.