The only American mangaka I know of, who was published there, is CJ Michalski.
Here is a link to one of her mangas: http://www.mangago.zone/read-manga/itsuka_koi_ga_kanau_made/
Guilt pleasure maybe?
It's not them but this manga looks interesting. Thank you!
AHHHH YES IT IS, thank you!! Finally.
Their most popular is "In these words" if that's what you are looking for
It's a yaoi series by two US authors that got published in Be Boy Gold i think... It's so famous how the fuck i forget the title... Tried searching but no result :/