Quarto Translations have a dedicated team of mother-tongue translators who specialise in translation work for publishers. All book translations are proof read by a second qualified translator and then proofed for a third time in-house before they send the final translation back to the client.
They cover over 400 languages. They provide a range of other services including typesetting, repro, print and distribution.
You would not let just anyone write for you – so why would you let just anyone do your translation work for your book or magazine?