​Kim Jeong-Ho (김정호; pen name Gosanja (고산자,‘the guy of old mountain’); b. circa 1804 – d. circa 1866) - one of key Korean historical figures, he was a geographer and a cartographer who was believed to have walked the entire length and breadth of the Korean peninsula in order to compile and research comprehensive data of the entire Korean landscape and border, resulting in the Dae-Dong-Yeo-Jido, (대동여지도), his masterpiece.

Kim Jeong-Ho

Source: http://korea.prkorea.com/wordpress/english/2012/10/04/great-people-of-korea-1/