The International Congress on Industrial and Applied Mathematics, or ICIAM, is known as the largest congress in applied mathematics, held only once every four years. The first ICIAM took place in Paris in 1987; and then in Washington, D.C (1991), Hamburg (1995) and Edinburgh (1999). The next venues were Sydney (2003), Zürich (2007), Vancouver (2011), Beijing (2015), and Valencia (2019). ICIAM 2023 Tokyo is the 10th congress. The number of participants for the recent ICIAM congresses exceeded 3,000, and for ICIAM 2023, more than 4,700 participants have registered including online-only participants. Have you ever been to Japan? In this episode, two Japanese mathematicians, Ken Hayami and Hisashi Okamoto, share some interesting background information that may enrich your experience at ICIAM 2023 Tokyo.   Ken Hayami, born in 1956, obtained his master’s degree in 1981 from the University of Tokyo and began his career as a researcher at the NEC Corporation. He obtained PhD degrees from the Wessex Institute of Technology (1991) and the University of Tokyo (1993), respectively. In 1993, he joined the faculty of the University of Tokyo and later he moved to NII/Sokendai, where he is now professor emeritus. Ken Hayami has been the president of the Japan SIAM since June 2023. Hisashi Okamoto, born in 1956, obtained his PhD from the University of Tokyo in 1985, supervised by Hiroshi Fujita. He previously held positions at the University of Tokyo and the Research Institute of Mathematics (Kyoto University), and is now at Gakushuin University in Tokyo. He was an invited speaker at the 1998 International Congress of Mathematicians in Berlin.  Hisashi Okamoto has been the editor-in-chief of the Japan Journal of Industrial and Applied Mathematics since 2016.