Heck holds the A.A. from Concordia University Wisconsin, the B.A. from Concordia Senior College, the M.Div. from Concordia Theological Seminary in Fort Wayne, Indiana, the Th.M. from Trinity Evangelical Divinity School in Deerfield, Illinois (where he studied under Gleason Archer and Walter Kaiser), and the Th.D. in Exegetical Theology from Concordia Seminary, St. Louis (Horace Hummel, advisor).
He served as pastor of Zion Lutheran Church, Valley Park, Missouri, from 1975 to 1984, chairing the LCMS’s Missouri District Board of Evangelism for much of that time. He then served as a theology professor at Concordia University Wisconsin from 1984 to 1998, and as chief academic officer and then full-time theology professor at Concordia University Texas from 1998 to 2022. He currently serves as the Interim President of Concordia Lutheran Seminary in Edmonton, Alberta.
He has authored or edited fifteen books, five of them on C. S. Lewis, and he teaches Old Testament, New Testament, and the life and writings of C. S. Lewis. Heck has researched events in the life of C. S. Lewis, catalogued day by day and year by year throughout Lewis’ life, an extensive database of more than 700,000 words and more than 1,300 pages of biographical information called “Chronologically Lewis” that is available on his website. This database has led to the publication of a C. S. Lewis calendar through Concordia University Press, several articles, and at least three books. The research also contains the military record of Lewis’ brother, Warren Lewis.