The Brothers Grimm
When it comes to the history of the fairy tale, the Grimm brothers had essentially the same effect on the nineteenth century that Disney had on the twentieth.
Jacob and Wilhelm Grimm were linguists, folklorists, and cultural historians, who were interested in recuperating and preserving the oral traditions of their nation, and so set out to collect all the folktales they could, particularly those they considered representative of German culture.
Between 1812 and 1857, they published and republished collections of tales that were widely distributed and translated. By collecting diverse tales into these individual, widely available volumes, the Grimms essentially created a kind of universal reference for the Western tradition of fairy tales, at the same time that they reinvigorated interest in the genre.
They thus had a major impact on the life of fairy tales in the popular imagination in modern times, and heavily influenced many contemporary adaptations of fairy tales, including the Disney films.