Know of Any US Tax Preparers Who Specialize in US Taxes for Foreigners?

We're looking for recommendations for a US tax preparer BUT, who also specializes in US taxes for non-US residents. Preferably this person would be located outside the US.

(We're a half American/half Swedish team, and our studio is based in California.)

We were disappointed with the tax company we worked with this past year (US-based), as they were unfamiliar with how to handle taxes for non-US residents, ending up in unnecessary delays. (We caught numerous errors on our tax forms before they went out, such as the tax agency listing my co-founder as a US citizen, but it's disconcerting our tax professionals wouldn't catch these types of errors before we reviewed the tax paperwork they prepared for us...)

We found that American tax specialists outside the US have significantly more experience handling taxes for companies with both domestic and foreign partners. Unfortunately, the person we found with this type of experience has too many clients already, although she was a tremendous help this past year!

tldr; Have you used a US tax specialist - not located in the US - who you can recommend?...or have you heard anyone else speak highly of a particular person/company?

Thanks so much, in advance, for your help!