Christos Papakyriakopoulos was a scientistic with a brilliant mathematical mind. He did his research on geometric topology at Princeton University, USA, where he was known simply as "Papa" because of the difficulty of his peers to pronounce Greek last names. He graduated from Varvakeion and finished his doctorate at the University of Athens in 1943. A letter to Ralph Fox on Dehn's lemma opened Princeton's door for him. He went to Princeton marked as a communist since he had participated in the Resistance with EAM and the demonstrations of December 3rd, 1944.