While at Cornell , he studied under Max Black and , briefly , Ludwig Wittgenstein .
From there he entered Cornell University as a Susan Linn Fellow in Philosophy and , by 1954 , had earned his PhD in that subject .
While at Cornell University , he studied under Max Black and , briefly , Ludwig Wittgenstein .
From there he entered Cornell University as a Susan Linn Fellow in Philosophy and , by 1954 , had earned his PhD in that subject .