Mathematician in 300: Euclid's Elements in Alexandria

The modern job splits in two. A few tens of thousands of research mathematicians worldwide prove new theorems at universities and institutes, a career that runs through a PhD, years of postdoctoral wandering and a brutally narrow academic market. A far larger group applies the same training in finance, cryptography, machine learning and government: the US Bureau of Labor Statistics counted only a few thousand people holding the literal job title "mathematician" in 2023, while math-trained quants, actuaries and data scientists number in the hundreds of thousands.

This page follows the trade from Plimpton 322 and the Rhind Papyrus through al-Khwarizmi's Baghdad, the Newton–Leibniz calculus feud and Hilbert's 23 problems, to Wiles's attic, Perelman's refusals, and machines that now solve olympiad problems at gold-medal level. It covers how people actually become mathematicians in different countries, what the daily craft looks like, who reached the top of the profession and how — and how much of the work AI can realistically absorb.

What does a mathematician actually do all day? Research mathematicians spend their days trying to prove statements no one has proved: reading papers, computing examples, filling blackboards, and writing up the small fraction of ideas that survive. Most also teach and supervise students. Applied and industrial mathematicians build and analyze models — of markets, machines, diseases or data — where the mathematics must answer to messy reality. Very little of either job is arithmetic.