A project manager is

A project manager is the person who has the overall responsibility for the success of projects. Below is responsibilities list for a project manager.
* Manage the project taking into account integration across all areas.
* Engage with stakeholders.
* Develop Project Plan.
* Direct project resources.
* Monitor and manage the project schedule.
* Monitor and manage the project budget.
* Monitor and manage the project risk.
* Deal with operational issues.
* Organise steering committee meetings, including ensuring that minutes will be taken.
* Report to the steering committee, raising strategic issues.
* Prepare Project Status Reports and Project Change Requests for the steering committee.
* Ensure project meets requirements and objectives .
* Manage project team members.
* Negotiate and resolve issues as they arise across areas of the project and where they impact on other activities, systems and projects.
* Look after the interests of the project team.
* Organise and chair project reference group meetings, as appropriate.
* Communicate project status to project sponsor, all team members, and other relevant stakeholders and involved parties .
* Maintain project documentation.
Additional important remarks, in order to be successful, the project manager must be given support and authority by senior management.