Project Manager
The Project Manager (PM) is the person in charge of a project and its progress through the rounds. The ultimate goal of the PM is to help the project be as consistently proofed and formatted as possible for the PPer. One way the PM (usually) does this is by writing Project Comments.
Different PMs have different styles. Some provide a handful of books that they pre-process themselves, then during proofreading monitor the project threads closely, and finally post-process the project themselves; others provide large quantities of books and rely on others to PP them. Other PMs fall somewhere between, perhaps closely following some books, while only glancing in on others, as questions are asked in the project thread.
If you are interested in becoming a PM, visit Access Requirements. If you are a new PM, see the Project Managing FAQ.