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 ?
What else did Horace Mann do in his last years besides serving as President of Antioch College?
Horace Mann was nominated for governor of Massachusetts by the Free Soil Party, and the same day was chosen president of the newly established Antioch College at Yellow Springs, Ohio.
What did Horace Mann do in the Unitarian church ?
Horace Mann himself was charged with nonadherence to sectarianism because, previously a Congregationalist by upbringing, he joined the Unitarian Church.

Question: Did he write any books in his later years ?
Self-contained rewrite: Did Horace Mann write any books in his later years?