William Y.T. Hsu passed away on December 14, 2020 in El Centro. He was 80. He was born in Shanghai, China on April 21, 1940 to his parents, Peter and May Hsu. His family moved to Hong Kong in 1947 and then to Los Angeles in 1955. He graduated from Cal Poly San Luis Obispo with a degree in chemistry and food processing He served honorably in the U.S. Army. He moved to El Centro in 1967 and worked for the Imperial County Health Department and served as the Director of Environmental Health for 15 years. He was a professor at Imperial Valley College for over 26 years and taught environmental health, wastewater treatment, food safety and mathematics. He enjoyed dove hunting, fishing in the Salton Sea, trips to the desert, and all the many get-togethers with his welcoming in-laws: the late Rose Quan, John and May Woo, Dr. William and the late Anna Quan, the late Eddie and Susie Quan and their families. He enjoyed sharing stories with everyone and spending time with his grandchildren. His sister Rosie always watched over him, ever since childhood. He was a Baptist and loved Jesus. He will be missed by his wife Ida. He is survived by his brother Paul Hsu (Shirley); his sister Rosie Fan (Ben); his children Dr. Brian Shue (Denise), Kenny, Michael (Lulu), Stephen (Jenny), and Dr. Julie Groom (Colbey); 7 grandchildren and 2 great grandchildren. He was preceded in death by his sister Jeannie Tucker. A private service will be held.