You can be what's called an " assistant professor, " which is the youngest, or at least, least-experienced kind of professor;you can be an " associate professor" ;or you can be a " full professor."
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After completing his studies in 1986, he became a full professor at Harvard in 1993 and was chairman of the economics department from 2003 to 2006. Alessina has published five books.
It was true of the associate professors, it was true of the full professors, and the administrators served that enterprise and were bound by the same ethos.