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He was born in 1871 in Iowa.
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He started working with the dairy business in 1911, only serving ice cream as a local business.
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McCullough started, with his son, making a recipe for soft serve ice cream. When he came up with the best recipe, he sold it. It sold 1,600 cones for 10 cents each in only 2 hours.
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McCullough started his first ice cream stand serving soft serve ice cream only in 1940 in Joilet, Illinois. He called it Dairy Queen.
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Between 1947 and 1955 it went from 100 locations to 2,600 locations.
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He died of cerebral thrombosis
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There are about 6,000 Dairy Queen locations worldwide.