Father Mma was ordained July 1, 1995, in Nigeria for the Diocese of Makurdi, but was later assigned to the newly created Diocese of Gboko. He arrived in the US in 2014, and after a brief stay at St. Augustine Cathedral, his first assignment was as parochial vicar at Immaculate Conception in Yuma.

In 2017, he was named administrator at Holy Cross, Morenci and Sacred Heart, Clifton. In 2019, he became pastor at those parishes and the mission they serve in Duncan - St. Mary's Mission.