Father Johnson was ordained to the priesthood in Savannah. It has been the joy of his life. His first assignment was at Sacred Heart Parish in Warner Robins. Two years later, the bishop asked him to go on for further studies at the Pontifical John Paul II Institute for Studies on Marriage and Family in Washington, D.C. There he began work in the Sacred Licentiate in Theology (i.e., STL) degree program with a focus on modern technology and bioethics.

He returned to the diocese in 2012, and after two years as a parochial vicar at St. Teresa Catholic Church in Grovetown, he was named Pastor of St. Christopher Catholic Church in Claxton and its three mission parishes in Pembroke (i.e., Holy Cross), Glennville (i.e., St. Jude), and Sandhill (i.e., Our Lady of Guadalupe) respectively. During this time, he began serving as the Chaplain to the Catholic Eagles of Georgia Southern University. In 2019, he was named Pastor of St. Matthew Catholic Church and Newman Center and Associate Vocation Director for the diocese. For the past seven years, approximately 70 percent of his time has been spent in ministry to college students and young adults.

Bishop Stephen Parkes named him Pastor of St. Joseph Catholic Church in Macon on July 1, 2022. He currently serves as the Vicar Forane for the Macon Deanery and on the Priest Personnel Committee for the Diocese of Savannah. He also continues as an Associate Vocation Director.