He ended up at City University of New York, became a full professor at age thirty three, died in his early '50s, did not lead a good life but had extraordinary discoveries.
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."
Many people think " a professor is a professor, " but when it comes to, for example, getting paid, full professors usually make more money than associate professors, and associate professors make more money than assistant professors.