naucnyj sotrudnik i procee

[Giampaolo Gandolfo]

    I am afraid I do not quite understand the exact meaning and the academic relevance of the following Russian terms: naucnyj sotrudnik, starshij naucnyj sotrudnik, vedushchij naucnyj sotrudnik.
    Will anybody help me (on or off list)? Bol'shoe vam spasibo.
Sincerely
        Giampaolo Gandolfo

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