1. Plato

2. Aristotle

3. Francis Bacon

4. Spinoza

5. Voltaire 

6. Immanuel Kant 

7. Schoepenhauer

8. Herbert Spencer

9. Fredrich Nietzche

 

The Contemporaries:

Europeon

1. Henri Bergson 

2. Bendetto Croce 

 

American

1. George Santayana

 2. William James

3. John Dewey