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Korea Post is introducing three inductees of the Korea Science and Technology Hall of Fame - Jang Yeongsil, Heo Jun, and Ree Taikyue - in the “distinguished scientists and engineers who brought honor to Korea” stamps. Jang Yeongsil (1390~1450) was the greatest mechanical engineer of the Joseon period. He led the advancement of science and technology under King Sejong. Though he was born in the lower class nobi (slave), he managed to break the class barrier through his outstanding abilities and sheer determination. He invented many time and astronomical devices when he worked as a court engineer, including Clepsydra and Okru, sophisticated self-striking water clocks and automatic alarm devices; Hemispherical Sundial; and Celestial Globe. Jang also took part in the production of an advanced metal-type printing press, thereby helping to usher in the golden age of Korean science and discovery. Heo Jun (1539~1615) was a physician who greatly furthered the advancement of traditional Korean medicine, and he wrote a number of medical texts to make medical knowledge accessible and comprehensible to the common people. In Dongui bogam, a medical text integrating Korean and Chinese medicine, he systematically organized symptoms, diagnoses, treatments, and preventions of illnesses. The book is regarded as the definitive text of traditional Korean medicine. Among his other books are Chando bangnon maekgyeol jipseong, a text for the science of diagnosis through pulse; Eonhae gugeupbang, an emergency medical text for commoners featuring Hangeul translation; Eonhae taesan jibyo, a medical text on obstetrics and pediatrics for commoners; and Sinchan byeogonbang and Byeogyeok sinbang, medical texts for dealing with epidemics including typhus and scarlet fever. All texts written by Heo Jun are masterpieces that embody the best of Oriental medicine at the time. Ree Taikyue (1902~1992) was a world-class theoretical chemist who worked actively not only in Korea but also in Japan and the U.S. Upon receiving a Ph.D. in science from Kyoto Imperial University, he became the first Korean professor at the university despite the fact that he was from a colony of Japan. Following Koreas liberation, Ree founded the Korean Chemical Society and laid the foundation for the development of chemistry in the country. He then moved to the U.S. and earned international recognition for his outstanding papers including one on the Ree-Eyring Theory. During his time at both the University of Utah and the KAIST (Korea Advanced Institute of Science and Technology), he ran a graduate program to train Korean chemists and contributed to the advancement of chemistry in Korea.