He is the author of the 2010 New York Times Best Seller Radical: Taking Back Your Faith from the American Dream.

[2][3] 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.

[7] In February 2017, Platt began serving as interim teaching pastor at McLean Bible Church in Vienna, Virginia.

[9] Also during Platt's tenure at McLean, in certain lawsuits, the church has been accused of not being transparent in specific areas, including its tithes and donations to the Southern Baptist Convention.