Professor Tatsuhiko (“Tats”) Kawashima died on November 4, 2021. He earned bachelors and masters degrees in economics from the University of Tokyo and received the Ph.D. in Regional Science from the University of Pennsylvania in 1969.  He was then appointed Assistant Professor of Regional Science at Penn. He resigned from the position in 1973 to return to Japan as Assistant Professor of Economics at Gakushuin University.  He was promoted to professor at Gakushuin in 1976. He took emeritus status in 2011. In addition to his research on regional economic development, Professor Kawashima engaged in  humanitarian work installing clean water and sewage infrastructure in mountainous northern Thailand with his students, and he was a member of an advisory panel to the Ministry of Land, Infrastructure, Transport and Tourism in Japan.  He is survived by his daughter, Crown Princess Kiko and his son-in-law Prince Fumihito, and three grandchildren—the former Princess Mako, Princess Kako and Prince Hisahito.