You need to speak to someone who is familiar with the US /France Treaty.
ARTICLE 20 Teachers and Researchers 1. An individual who is a resident of a Contracting State immediately before his visit to the other Contracting State and who, at the invitation of the Government of that other State or of a university or other recognized educational or research institution situated in that other State, visits that other State for the primary purpose of teaching or engaging in research, or both, at a university or other recognized educational or research institution shall be taxable only in the firstmentioned State on his income from personal services for such teaching or research for a period not exceeding 2 years from the date of his arrival in the other State. An individual shall be entitled to the benefits of this paragraph only once. 2. The provisions of paragraph 1 shall not apply to income from research if such research is undertaken not in the public interest but primarily for the private benefit of a specific person or persons.
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