Physicist with a namesake "shift” (7)

(Other definitions for doppler that I've seen before include "Scientist who had effect" , "Physicist after whom perceived shift in frequency with motion is named" , "Austrian physicist, d. 1853 famous for his discovery of the effect of movement on perceived wavelengths" , "Austrian physicist (1803-53), known for his "effect"" , "Red, blue shifts are examples of this effect" .)