My first professional publication for Ars Magica came out in 1993, in White Wolf Magazine. Things rather grew from there, and I spent over a decade as the Line Developer. When I retired from that position, I ended up taking a break for a few years, but now I’m back.
First, I prepared the text for the upcoming Definitive Edition. The text is now done and is being laid out, and the crowdfunding launches in a few days.
Second, part of the crowdfunding is the release of Ars Magica under an open license (CC BY-SA), and I have a Patreon at which I am writing for that license. The licensing has not happened yet, but I have permission from Atlas to do that. When you have been working with them on the line for years, you can do that.
I am looking forward to writing for the game again!