Mark D. Baker has authored a number of books in English and Spanish. He was a missionary in Honduras for ten years and a campus minister with InterVarsity Christian Fellowship for three years. He taught at Fresno Pacific Biblical Seminary (formerly Mennonite Brethren Biblical Seminary) from 1999-2024. He has continued ministry involvement in Latin America and, since 2008, has led a weekly Bible study in the county jail.

Areas that he has taught and written about include atonement, contextual theology, Galatians, centered-set church, Anabaptist ethics for contemporary life, honor-shame, Jacques Ellul, and Latin America.