Man Hyong Yoo

Dec 21, 2015

Man Hyong Yoo (BS ’60, MS ’62, PhD ’66 Engineering), Oak Ridge, Tenn., lost his brief battle with colorectal cancer on Aug. 12, 2015, resulting from complications from surgery at the Hospital of the University of Pennsylvania in Philadelphia, Pa. He was 80. 

He was born in Seoul, Korea, on June 27, 1935, the son of Hae Chang Yoo and Chang Kyu Lee. 

He lived through the challenges of Japanese occupation during World War II and the Korean War (1950-1953), having to provide as man of the house while his father and elder brothers were away. 

He graduated from the famous Kyunggi High School in Korea and traveled to the United States in 1956 to advance his studies. He attended Michigan State University and received three degrees in engineering: a bachelor’s (1960), master’s (1962) and PhD (1966). 

After receiving his PhD in materials science, he joined the Oak Ridge National Laboratory in 1967 and retired in 2003. 

His distinguished career included collaborations and he spent several years living abroad in Germany, Japan, and Korea, but always returning home to Tennessee. After retirement, he finally satisfied his itch to teach by joining the faculty at KAIST in Daejon, South Korea, and later receiving an appointment to Seoul National University in 2005. 

His accomplishments include significant and seminal contributions to the fundamental understanding of plastic deformation, radiation damage, and high temperature flow and fracture. His achievements have led the frontier of understanding for both intermetallic materials and hexagonal close-packed metals and alloys. 

He was the author of more than 180 scientific research papers and numerous book chapters, editor of three books and several conference proceedings, and presenter of more than 50 invited talks.

He received the Humboldt Research Award for Senior U.S. Scientists. He was recognized by his peers at The Minerals, Metals and Materials Society (TMS), which elected him as one of its 100 Living Fellows and conferred on him the Mathewson Gold Medal in 2002. 

He married Sung Ja Choo on Sept. 10, 1960, while a graduate student.

He is survived by his wife of 55 years Sung Ja Yoo, three sons, Phillip, Terry (and spouse Penny), and Christopher (and spouse Kris), and six grandchildren. 

Services were Aug. 15 at the Chadwick & McKinney Funeral Home in Ardmore, Penn. 

In lieu of flowers, donations can be made to the Abramson Cancer Center at University of Pennsylvania in the memory of Man H. Yoo through this web address: or by filling out and submitting the form at this web address: