Petersburg University in Russia. He went on to study natural sciences there. While studying, his professor of physiology, Élie de Zion, impacted Ivan the most. Between the two of them, there was a “mutual admiration for one another”. After graduating in 1875, Pavlov followed his admired professor to the Military Medical Academy located in St. Petersburg. Zion was the head of the physiology department here, and Ivan soon was upgraded to be the assistant to Zion. His main job was helping Zion in the laboratory. Zion was eventually fired because the academy learned that he was Jewish. Pavlov also decided to leave, and went on to attend the Veterinary Institute where he focused on circulation and digestion. His new interest in digestion led him to travel to Prussia in 1877 where he would study a specialist in digestion. He received his medical degree in 1879 and his postdoctoral degree in 1883 (“Ivan Petrovich