Austrian mathematician and physicist.
In 1842, at the age of 38, Doppler gave a lecture to the Royal Bohemian Society of Sciences and subsequently published his most notable work, “Über das farbige Licht der Doppelsterne und einiger anderer Gestirne des Himmels” (On the coloured light of the binary stars and some other stars of the heavens). In this work, Doppler postulated his principle (later coined the ‘Doppler effect’) that the observed frequency of a wave depends on the relative speed of the source and the observer, and he tried to use this concept for explaining the colour of binary stars.
In Doppler’s time in Prague as a professor he published over 50 articles on mathematics, physics and astronomy. In 1847 he left Prague for the professorship of mathematics, physics, and mechanics at the Academy of Mines and Forests in Selmecbánya (then Kingdom of Hungary, now Banská Štiavnica, Slovakia).
In 1849 he moved to Vienna where he was appointed head of the Institute for Experimental Physics at the University of Vienna in 1850. During his time there, Doppler, along with Franz Unger, played an influential role in the development of young Gregor Mendel, known as the founding father of genetics, who was a student at the University of Vienna from 1851 to 1853.
Doppler died on 18 March 1853 at age 49 from a pulmonary disease in Venice.
Link to Wikipedia biography