Born 19th of April 1923.
Personal name: Hōsō Sōshitsu XV (Sen Genshitsu) 汎叟 宗室
Zen name: Hōunsai 鵬雲斎
He studied economics at Doushisha University in Kyoto. And graduate studies at the University of Hawaii. Also known as Dr. Sen Genshitsu.
He became the 15th generation Oiemoto of Urasenke in October 1964. January 1st, 2003 his son succeeded him as the 16th generation Oiemoto. At this point Hounsai became known as Hounsai Daisosho.