11. Hartshorne is also noted for developing Alfred North Whitehead 's process philosophy into process theology. 12. He turned then to Alfred North Whitehead  and his notion of prehension or perspective. 13. He is currently Alfred North Whitehead  Fellow in the European Graduate School, Saas-Fee, Switzerland. 14. The phenomenon of inert knowledge was first described in 1929 by Alfred North Whitehead : 15. 23 . ` PRINCIPIA MATHEMATICA,'Alfred North Whitehead  and Bertrand Russell 16. Alfred North Whitehead  and Bertrand Russell set out to do just that in Principia Mathematica.17. Last, but not least, there is the process philosophy inspired by Alfred North Whitehead 's works. 18. The philosopher Alfred North Whitehead  remarked that all philosophy is but a footnote to Plato. 19. He had been a promising philosophy professor at Howard University and a prot�g?of Alfred North Whitehead . 20. Another notable author is Alfred North Whitehead .