Hello! I think some more context needs to be revealed here for what's after those phrases, but I'll do my best at present with what you've given.

Haroun Tazieff, a Polish scientist,  is correct. Using it in a sentence, I would use it as such:

Haroun Tazieff, a Polish scientist, was a famous cinematographer of volcanic eruptions and lava flows, and the author of several books about volcanoes.

If I am to use the above sentence, in another way, I would also choose The Polish scientist, Haroun Tazieff as correct, as well.

The Polish scientist, Haroun Tazieff, was a famous cinematographer of volcanic eruptions and lava flows, and the author of several books about volcanoes.

If I am introducing the person of interest, I would introduce his name first, what his occupation was, and then what he was famous for. While both sentences I've written are grammatically correct, the first sounds more natural and the idea flows more smoothly.