It's better to know these authors...

1. Albert the great (-1280)
2. Alphonsus Liguori, St. (1696-1787)
3. Ambrose, St. ( 337-397)
4. Aristotle (384BC-322BC)
5. Augustine of Hippo, St. (354-430)
6. Azor, John
7. Bonaventure, St.
8. Cahill, Lisa
9. Cicero
10. Congar, Yves
11. Connery, John R.
12. Curran, Charles E.
13. Descartes, Rene
14. Finnis, John
15. Fuchs, Josef
16. Gill, James
17. Grisez, Germain
18. Gula, Richard M.
19. Haring, Bernard
20. Hume, David
21. Ignatius of Loyola, St.
22. Janssens, Louis
23. John XXIII
24. John Paul II
25. Kant, I.
26. Knauer, Peter
27. Kung, Hans
28. Leo XIII
29. Luther, Martin
30. MacIntyre, Alasdair
31. May, William E.
32. McCormick, Richard A.
33. Monden, Louis
34. Moore, George E.
35. Origen
36. Paul VI
37. Peter Lombard
38. Plato
39. Rahner, Karl
40. Ramsy, Ian
41. Ratzinger, Joseph
42. Scheler, Max
43. Schuller, Bruno
44. Socrates
45. Stoics
46. Suarez, Francis
47. Thomas Aquinas, St.
48. Ulpian
49. Vasquez, Gabriel
50. William of Ockham