Doppler effects

Roger M. Lhermitte (May 28, 1920-November 21, 2016) was a French meteorologist who "pioneered the development of meteorological Doppler radar." His career extended from the 1950s until his death where he made numerous contributions to the field of radar meteorology resulting in over 100 publications and numerous patents.

Christian Andreas Doppler ( ; 29 November 1803 – 17 March 1853) was an Austrian mathematician and physicist. He formulated the principle – now known as the Doppler effect – that the observed frequency of a wave depends on the relative speed of the source and the observer.