For the last several months, I’ve had a a professional assignment writing an ongoing series for a well-known website as. It was repurposed from a book I wasn’t able to sell to a publisher.

It’s been well-received as a series, so I’m thinking about working up a new proposal and shopping it around again. It occurs to me it might be a win-win if I could convince the website to co-brand it as “presented” by them. Does anyone have any experience with anything like this? Would I owe them a flat fee, or a percentage, or would that all be a negotiation? It’s probably a similar situation as when someone writes an introduction to your book (I’d probably ask for that as well). But do they then become a co-author?