Chairperson (noun)

1. A person who presides over a meeting or organization.
2. The person who is in charge of or responsible for the management of a particular department or organization.

Origin:

Late 19th century: from chair + -person.

Examples:

1. She was elected as the chairperson of the committee.
2. The chairperson is responsible for making sure the meetings run smoothly.
3. The board chose a new chairperson to lead the organization.
4. The chairperson of the club makes all the major decisions.
5. The chairperson's duties include overseeing all committee meetings.