Chairperson
Part of speech: noun
Definition: a person who presides over a meeting, a board, etc.
Chairman
Part of speech: noun
Definition: A person presiding over a meeting.The head of a corporate or governmental board of directors, a committee, or other formal entity.Someone whose job is to carry people in a portable chair, sedan-chair, or similar conveyance.
Example sentence: I've been involved with Carnegie Hall for the last 13 years, and Chairman for the last six. I feel really good about what we've done growing our educational programs there, building a board that has made Carnegie Hall really a world-class institution.