From Project: Redcap
The Ars Magica Line Editor is an Atlas Games employee in charge of product development for the whole Ars Magica Product Line. He or she decides what books are needed and when, commissions authors (usually freelancers) to write them, edits the manuscripts, and enforces Atlas Games quality standards and other policies. The Line Editor also acts as a company representative to the Fan Community and is in charge of the Playtest process.
This position was previously called the Line Developer.