The Project Director is also known as the Head of Projects. This role generally describes a management position where an individual will have a split role in terms of responsibility and deliverables. In many organisations the Head of Projects will have a team of project staff to manage, which may include Project Managers, Project Engineers, Project Support staff. This management function will be key in terms of resource management, ensuring that project personnel are assigned to the portfolio of projects as well as business as usual activities.
In addition to this many Head of Projects roles will have a responsibility for the delivery, maintenance and adherence to project standards. These project standards may be bespoke to the company, based upon industry recognised standards or implementations of recognised methodologies.
Typically Head of Projects will come from a formal project management background and have excellent skills in the area of people and process. In other organisations this may also be called Project Office Manager.