Ryoichi Sadanaga (1920-2002)

With profound regrets we send the sad announcement that Emeritus Professor Ryoichi Sadanaga, having struggled against cancer for the last few years, passed away on January 17, 2002. He was born in 1920 in Osaka Japan. After he graduated from the U. of Tokyo in 1943, he remained there first as a Research Assoc., then Lecturer and Assoc. Professor. He worked with the late. K. Lonsdale at the U. of London for two years starting in 1951. From 1954 to 1981 he taught and did research on X-ray crystallography and theoretical crystallography as Professor of Mineralogical Inst., Faculty of Science, U. of Tokyo. He successively held the posts of President of the Crystallographic Society of Japan and President of the Mineralogical Society of Japan. The crystallographic community of Japan has appreciated his great contributions to the promotion of crystallography in Japan not only in mineral science but also in material science. He successfully organized the IMA-Kyoto meeting in 1970 and the IUCr-Kyoto conference in 1972.After his retirement he became an honorable member of the Japanese Academy of Science. For many years he served on the Editorial Board of the Proceedings of the Japan Academy and made great efforts to publish papers relating to crystallography. During his career, he mentored many young Japanese crystallographers. His theoretical works on 'Diffraction Enhancement of Symmetry' and 'Space Groupoids' were acknowledged in the International Tables for X-ray Crystallography, Vol. A (1983).

We, his pupils, cannot adequately express our grief and sorrow at his passing.

Takamisu Yamanaka