János András Segner (9.10.1704-5.10.1777) — Hungarian mathematician and physicist. Born in Pressburg (now Bratislava, Czechoslovakia). In 1725 — 30 he studied at the University of Jena, in 1732 — 35 worked there (a professor from 1733), in 1735 —55 was a professor at the University of Göttingen, and from 1756 was at Halle.
He was engaged in designing and improving various scientific instruments, and in particular invented (1750) one of the first reaction hydraulic turbines (the “Segner wheel”). He developed a theory of capillarity.
A Fellow of the Royal Society (1738), and a member of the Berlin Academy of Sciences (1746) and the St Petersburg Academy of Sciences (1754).