Conversation so far:
What was the position of Horace Mann at the Antioch College ?
chosen president of the newly established Antioch College at Yellow Springs, Ohio.
How did Horace Mann pass away ?
He collapsed shortly after the 1859 commencement and died that summer.
Was Horace Mann ill ?
CANNOTANSWER.

Question: What else did he do in his last years ?
Self-contained rewrite: In addition to being president of Antioch College, what else did Horace Mann do in his last years ?