Jack Holmes, a 28-year United Parcel Service (UPS) veteran who has headed the operations of UPS Freight for the past year, has been promoted to president of the trucking unit.

Holmes replaces the retiring Gordon Mackenzie, who steps down Sept. 10.

Holmes, 47, headed the UPS transition team after the company acquired Overnite Transportation Co., later renamed UPS Freight. For the past year, he has served as the senior vp-operations for UPS Freight.