Born November 4, 1927, passed away at home on June 8, 2021. Yukio graduated from the University of Washington Medical School in 1955, after service to his country as a Navy corpsman. Married that same year to Julianne Sato, had 3 children Joyce (Jon), Ken (Jana), and Brian (Suzy). He was a pediatrician at West Seattle’s Children’s Clinic for over 30 years. Enjoyed his 8 grandchildren, Chris (Michelle), Allison (Geoff), Matthew (Jen), Colby, Hanna (Luke), Kellie, Lisa, and Jill. He is preceded in death by his parents, Yuji and Tosa Kumasaka and 2 brothers, Ryo and George. Memorial donations may be sent to: the Japanese Presbyterian Church of Seattle (Yukio’s home church) https://jpresby.org/ , Densho (in memory of the WWII incarceration of Japanese Americans) https://densho.org/ ,or the Chief Seattle Club (in memory of Yukio’s respect for Indigenous people) https://chiefseattleclub.org/ .