Abstract: An elevator door operator is disclosed according to several embodiments, including a single speed (i.e. single door) operator, a two speed (i.e. two door) operator and a center opening door operator. In each embodiment, the components of the door operator, including a drive motor, cog belt and pulleys, limit switches, a gate switch, door tracks and hangers, and mounting brackets, are pre-assembled, wired, and leveled as a one-piece integral unit on an elongate header plate, thereby allowing for quick and easy installation, repair and replacement. A computer controller with a self-contained LED display screen allows for onboard diagnostics and changing of operating parameters without the need for a laptop computer or other externally connected devices.