An offensive coordinator is a member of the coaching staff of a gridiron football team who is in charge of the offense. Generally, along with the defensive coordinator, he represents the second level of command structure after the head coach. The offensive coordinator is in charge of the team's offensive game plan, and typically calls plays during the game (though some offensive-minded head coaches also handle play-calling). Several position coaches work under the coordinator (position groupings can include quarterbacks, wide receivers, offensive line, running backs, and tight ends). The coordinator may also coach a position (typically quarterbacks).
Unlike most coaching positions in football, who are generally on the sidelines during games, offensive coordinators have the option of operating from the press box instead of being on the sideline. There are advantages and disadvantages to both locations.