Seub Nakhasathien was born on December 31, 1949, in Pracheenburi province. Since he was a child, he had been very dedicated and attentive, and had always been a very good student. After his graduation from the Faculty of Forestry, Kasetsart University, in 1975, he started working in the Wildlife Conservation Division of the Royal Forest Department. The Division at that time was newly established and very small. He decided to join this Division because he would like to work with wildlife more than dealing with forestry that had lots of hidden benefits.