Ewald Hering
Karl Ewald Konstantin Hering was a German physiologist who did much research into color vision, binocular perception and eye movements. He proposed opponent color theory in 1892.
Hering was born in Altgersdorf in Saxony, Germany. He grew up in a probably poor family, son of a Lutheran pastor. Hering attended gymnasium in Zittau and entered the university of Leipzig in 1853. There he studied philosophy, zoology and medicine. He completed an M.D. degree in 1860.
Source: Wikipedia