Professor in 1158: Authentica habita protects the scholar

There is one standard route in almost everywhere: a doctorate, then years of temporary research posts, then a permanent academic appointment that most doctorate-holders never obtain. The training is long not because the knowledge is dangerous, as in medicine, but because the job demands something rarer — producing knowledge that did not exist before, and defending it in public before rivals who are paid to find its flaws. Selection happens continuously, and mostly through publication.

This page follows the profession from the Academy and the medieval masters' guilds through Humboldt's research university and the postwar boom that multiplied faculties worldwide. It covers how people actually become professors today in different countries, what the working week really contains beyond the lecture, who reached the top of the craft across twenty-five centuries, and how much of the job artificial intelligence can realistically absorb.

Do you need a PhD to become a professor? At research universities, almost always: the doctorate is the profession's baseline credential in nearly every country. The main exceptions are professors of practice — distinguished judges, architects, artists or executives appointed to teach their craft — and some conservatoire and fine-arts traditions where a professional reputation substitutes for a doctorate. German-speaking systems historically demanded even more: a second, post-doctoral thesis called the Habilitation.