A physicist.[ref]
https://www.academie-sciences.fr/pdf/dossiers/Fizeau/Fizeau_od1.htm. Independent biographical identity and professional specialization
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Hippolyte Fizeau (1819–1896) was a French physicist known for his significant contributions to the field of optics and for his work on the speed of light. One of his most notable achievements was the first successful measurement of the speed of light in 1849, using a rotating toothed wheel apparatus.