A Pioneer of modern Korean type design and typeface research. He moved to Japan, where he worked at a printing company, mastering various printing techniques, and studied at Yodobashi Art Academy. In 1957, he developed the Dong-A Publishing Typeface, which received high acclaim. In the early 1970s, he collaborated with Japanese phototypesetting companies Shaken (寫硏) and Morisawa (モリサワ) to create Hangeul typefaces. In his later years, he focused on writing and researching the philosophy and principles of Hangul design. He developed several Hangeul body text typefaces and display typefaces, including Semyeongjo, Jungmyeongjo, Junggothic, Taegothic, and Gyeonchulgothic, as well as various stylized typefaces.