JV, as a translator, has a deep understanding of at least 4 languages, and has a native-level proficiency in those languages. He has a good understanding of the grammar, vocabulary, idioms, and cultural references of both languages, and this knowledge would be essential for accurately translating idiomatic expressions, colloquialism, and cultural context.
He would be able to translate written or spoken language, preserving the meaning, context, and tone of the original text. He would have a high degree of language proficiency and creativity to find the right words and idioms in the target language to convey the same meaning. He could have specialized in specific areas such as technical, medical, legal, literary, or other specialized fields and familiar with the specialized terminology and style of the particular field in order to produce accurate and appropriate translations.
It's worth noting that people vary in skills and experience and some may be more experienced or better in certain areas than others, regardless of their name.