He served at New Orleans Baptist Theological Seminary as Dean of Chapel and Assistant Professor of Expository Preaching and Apologetics. He was serving at Edgewater Baptist Church in New Orleans when the parsonage where he lived flooded during Hurricane Katrina.[4]
In 2006, Platt was introduced as the new senior pastor of The Church at Brook Hills in Birmingham, Alabama.[5] At age 27, he became the youngest megachurch pastor in the United States.[2]
In February 2017, Platt began serving as interim teaching pastor at McLean Bible Church in Vienna, Virginia. During this time he continued in his primary role as president of the International Mission Board.[8] In September of that year, Platt was introduced as pastor-teacher of McLean Bible Church. In February 2018, he announced his resignation from the IMB on the hiring of his successor.[9]