Conversation so far:
where did Sarvepalli Radhakrishnan go to school?
Sarvepalli Radhakrishnan's primary education was at K.V High School at Thiruttani.
when did Sarvepalli Radhakrishnan start his academic career?
Sarvepalli Radhakrishnan started his academic career in April 1909 at the Madras Presidency College.

Question: what was his position there?
Self-contained rewrite: what was Sarvepalli Radhakrishnan's position there?