Conversation so far:
What was the position of Horace Mann at the Antioch College ?
From September 1852 to Horace Mann's death, he served as President of Antioch College.
How did Horace Mann pass away ?
Horace Mann collapsed shortly after the 1859 commencement and died that summer.
Was Horace Mann ill ?

Question: What else did he do in his last years ?
Self-contained rewrite: What else did Horace Mann do in his last years besides serving as President of Antioch College?