Who is or was the greatest Existentialist?

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1
Martin Buber
334651
114020
334650 Votes
2
Syed Abdul Sayeed
896
314
896 Votes
3
Ayala Gliksberg
701
222
701 Votes
4
Jean-Paul Sartre
1
2
Votes
5
Hossein Mesbahian
0
0
Votes