Manga and anime famously originate from Japan, and the vast majority of the big names in manga and anime are Japanese; Hayao Miyazaki, Hideaki Anno, Hiromu Arakawa, and Masashi Kishimoto come to mind.
Outside of Japan, I can really only think of one creator who had their work become an anime/manga: The Deltora Quest series was adapted into an anime and manga and was created by an Australian writer, Emily Rodda.
Aside from Rodda, however, are there any* international creators, particularly from the Western world, that have successfully published manga (or anime) in Japan, manhua in China, or manhwa in Korea? Have any Western studios created and produced** anime (or rather, anime-influenced) series?
* - An exhaustive list is not necessary; a few examples from various countries and maybe some stats versus Japan, if possible.
** - Not as a result of outsourcing.