Preside over is a term used to describe the action of overseeing or managing an event or organization. It can be done by a CHAIR, HEAD, moderator, runner, ruler, or officiant. A CHAIR is someone who presides over a meeting or discussion, a HEAD is the leader of an organization, a moderator is someone who manages a discussion or debate, a runner is someone who oversees the progress of a project, a ruler is someone who governs a country or region, and an officiant is someone who presides over a ceremony or ritual.