Erwin Schrödinger

Most people meet him through the cat: the thought experiment that has become shorthand for how strange quantum theory gets when you try to describe it in ordinary language. The physics underneath it is wave mechanics, and that is the work he is actually known for among physicists — a way of framing quantum problems that made them sharper and more tractable than the assumptions he inherited.

He was born in Vienna in 1887 and trained as a theoretical physicist, combining close attention to method with a willingness to look for the large structural lines of a field rather than only accumulating results. His early papers were noted less for novelty than for the clarity with which they were set out, and clarity stayed a working principle rather than a stylistic preference. Correspondence, travel and sustained reading built the technical range he needed; collaborations and apprenticeships gave him a craft ethos that stuck.

Mid-career brought consolidation and a widening of the problems he was prepared to take on. Rivals and critics mattered here — the pressure of having to defend an argument tightened both the argument and the exposition. Key publications and lectures turned what had been tentative into statements others could build on, and he moved between analysis and construction rather than committing to one mode. Students and interlocutors carried the approach past any single institution.

Later years went to systematisation: notes, editions and reflective essays aimed at fixing the best version of the central ideas. The surviving drafts and corrections show how contingent the process was alongside how rigorous. He died in 1961. Wave mechanics and the cat remain the usual emblems of his influence, though what carried furthest was arguably the standard he set for keeping an argument intelligible under pressure.