Red Delicious
The Red Delicious is a clone of apple cultigen, now comprising more than 50 cultivars, first recognized in Madison County, Iowa, in 1880. According to the US Apple Association website, it is one of the fifteen most popular apple cultivars in the United States.
John McIntosh (farmer)
While clearing his property, McIntosh discovered a number of seedling apple trees growing wild. He transplanted them to his garden, and by the following year only one had survived. Several years later, the tree was producing the crisp, delicious fruit that is now well known. The discoverer eventually dubbed it the 'McIntosh Red', which is still the apple's official name.