Sang-Heyon Ahn is a Senior Researcher at Korea Astronomy and Space Science Institute (KASI). He received his PhD in Astronomy from Seoul National University in 2001. After his PhD, he worked as a Research Fellow at the Korea Institute for Advanced Study for four years from 2001 to 2004. He then joined the KASI. Apart from research journals, he has published a few books such as "우리가 정말 알아야 할 우리 별자리", "한국사탐험대 4. 과학", and "뉴턴의 프린키피아" (all in Korean) for general public.