Here is my "Top Ten List of Most Influential Theologians." I'll quickly stress that the following theologians have influenced me the most, and only contains books that I've read too. I've excluded authors, if I've only read one of their books too. Some of these authors (like Calvin, Edwards and Warfield) are still very influential to me, but others like (G.E. Ladd and John Piper) were very helpful stepping-stones in the past but are no longer as influential to me as they once where. So there's several gotchas.

The following list is roughly in order by most influential theologian to least, and the titles are generally arranged by most influential to least influential with a supplemental list of related books I've read about the author worth noting.

1. John Calvin

   1. Institutes of the Christian Religion
   2. Calvin Commentaries
   3. Related:
      1. John Calvin (a biography by Theodore Beza)
      2. Calvin (a biography by Bruce Gordon)
      3. Lectures on Calvinism (by Abraham Kuyper)
      4. The Legacy of Sovereign Joy:  God's Triumphant Grace in the Lives of Augustine, Luther, and Calvin (The Swans Are Not Silent)
      5. Calvin and Augustine (by Benjamin Breckinridge Warfield)

2. Jonathan Edwards

   1. On The Freedom Of The Will
   2. An Unpublished Essay on the Trinity
   3. Religious Affections
   4. The Preciousness Of Time And The Importance Of Redeeming It
   5. The Nature of True Virtue
   6. The Sermons of Jonathan Edwards: A Reader
   7. The Blessing of God: Previously Unpublished Sermons of Jonathan Edwards
   8. The Blank Bible
   9. Related:
      1. Jonathan Edwards: A Life (a biography by George Marsden)
      2. The Supreme Harmony of All: The Trinitarian Theology of Jonathan Edwards by Amy Plantinga Pauw

3. Augustine of Hippo

   1. On The Trinity
   2. The City of God (translated by Henry Bettenson)
   3. Confessions
   4. Enchiridion
   5. The Literal Meaning of Genesis Vol 1
   6. Related:
      1. The Legacy of Sovereign Joy:  God's Triumphant Grace in the Lives of Augustine, Luther, and Calvin (The Swans Are Not Silent)
      2. Calvin and Augustine (by Benjamin Breckinridge Warfield)

4. Benjamin Breckinridge Warfield

   1. The Authority and Inspiration of the Scriptures
   2. Calvin and Augustine
   3. Biblical Doctrines
   4. Person and Work of Christ
   5. Studies in Theology
   6. Evolution, Science,  and Scripture: Selected Writings (edited by Mark Noll and David Livingstone)
   7. The Plan of Salvation

5. D. A. Carson

   1. The Difficult Doctrine of the Love of God
   2. Christ and Culture: Revisited
   3. The Gospel According to John
   4. Exegetical Fallacies
   5. The KJV Debate: A Plea for Realism
   6. For the Love of God: A Daily Companion for Discovering the Riches of God's Word Volume 1
   7. For the Love of God: A Daily Companion for Discovering the Riches of God's Word Volume 2
   8. The Farewell Discourse and Final Prayer of Jesus
   9. NT use of the OT
   10. Podcasts and online content

6. N.T. Wright

   1. Resurrection of the Son of God
   2. Jesus and the Victory of God
   3. The New Testament People of God
   4. Paul: In Fresh Perspective
   5. Judas and the Gospel of Jesus
   6. Related:
      1. The Future of Justification: A Response to N. T. Wright (by John Piper)

7. John Owen

   1. Death of Death in the Death of Christ
   2. On the Mortification of Sin in Believers

8. John Piper

   1. Desiring God: Meditations of a Christian Hedonist
   2. The Pleasures of God: Meditations on God's Delight in Being God
   3. The Future of Justification: A Response to N. T. Wright
   4. The Legacy of Sovereign Joy:  God's Triumphant Grace in the Lives of Augustine, Luther, and Calvin (The Swans Are Not Silent)
   5. Podcasts and online content

9. Martin Luther

   1. Table Talk
   2. 95 Thesis
   3. Babylonian Captivity of the Church
   4. Letter to the Christian Nobility of the German Nation
   5. Related:
      1. Here I Stand : A Life of Martin Luther (by Roland Bainton)
      2. The Legacy of Sovereign Joy:  God's Triumphant Grace in the Lives of Augustine, Luther, and Calvin (The Swans Are Not Silent)

10. George Eldon Ladd

    1. Theology of the New Testament
    2. The New Testament and Criticism
    3. The Gospel of the Kingdom
    4. Related:
       1. A Place at the Table: George Eldon Ladd and the Rehabilitation of Evangelical Scholarship in America (a biography by John A. D’Elia)