Monybuny is from Baliet, and is a member of the Ngok Lual Yak section of the Padang Dinka.
[1] Earlier in his career, Monybuny was a pastor for the Presbyterian Church in South Sudan and the Baliet County commissioner.
[2] After the creation of Central Upper Nile State from Eastern Nile State on January 14, 2017, Monybuny became governor,[3][4] due in part to ties with Vice President Taban Deng Gai.
[1] On January 28, 2018, Shilluk youth protesters blocked Monybuny's from entering the PoC camp in Malakal.
[6] Monybuny was replaced as governor of Central Upper Nile State by Peter Chol Wal.