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Associate Professor at Division of Applied Physics, Faculty of Engineering, Hokkaido University. He was born in Tokyo in 1964. He received his B. Eng. (1988), M. Eng. (1990), and D. Eng. (1993) degree from Hokkaido University (he studied about air-hydrate crystals in Antarctic ice). He served as a postdoctoral fellow of science and technology, the Science and Technology Agency (now the Ministry of Education) in 1992-1994 to study about the CO₂ sequestration in deep sea by gas hydrates. In 1994-2004, he worked in the National Institute of Advanced Industrial Science and Technology (now AIST) to study about the resource development of CH₄ hydrate. Then he has been working in Hokkaido University since 2004. H₂O science has always been the center of his interest, such as cryobiology, ultrafine bubbles, ice and gas hydrates.

Mika Ishigaki is an assistant professor in Faculty of Life and Environmental Sciences, Shimane University, Japan. She was selected as an Excellent Young Researcher in 2018 by Ministry of Education, Culture, Sports, Science and Technology, Japan. Ishigaki obtained Ph.D. in the field of elementary particle physics in 2006, and her present research has been active in the application of Raman and near-infrared spectroscopies to biology. She is especially interested in the development of new methods to evaluate the life activity using vibrational spectroscopies from the point of water structure.