Science fiction author and comic book writer Chris Roberson announced he will no longer work with DC Comics on Twitter, tweeting, “Having an afternoon cocktail to celebrate the end of my time at DC. Aside from the Fairest arc I already committed to doing, iZombie will be the last time I’ll ever write at DC.”

Bleeding Cool reports that to explain his reasons for leaving, Robertson pointed to this article by David Brothers for Comics Alliance, which details issues regarding DC’s handling of Before Watchmen, as well as Marvel’s handling of The Avengers.

To fans who wanted Robertson to continue to work on DC project, Robertson tweeted, “Sorry. In a better world, characters like the Legion would be owned by a more ethical company, but sadly not in this one.”

“The short version is, I don’t agree with the way they treat other creators and their general business practices.”

“I decided quite some time ago, but waited until after the cancellation of my book was announced to discuss it.”