He was reported to be a proficient milliner, but was known to proselytize frequently and stop work to pray and sing for co-workers who used profanity in his presence. He also began working as a street preacher and would sermonize and distribute religious literature in North Square.
Corbett soon earned a reputation around Boston for being a "local eccentric" and religious fanatic. On July 16, 1858, Corbett was propositioned by two prostitutes while walking home from a church meeting.