This excerpt taken from the NVR 8-K filed Nov 3, 2005.
5.01 Required Officers; Other Officers.
The corporation shall have a President and a Secretary and may have such other officers as are appointed by the Board of Directors or by other officers authorized by the Board to appoint additional officers. Each officer shall perform the duties prescribed by the Board of Directors or by direction of an officer authorized by the Board of Directors to prescribe the duties of other officers. The Board may appoint a Chairman of the Board and, if the Board so designates, the Chairman of the Board may be an officer of the corporation. The same individual may simultaneously hold more than one office.