There are 1000s of pear varieties, so ID is pretty much a guess. There are no native American pears, so yours grew from nursery stock or a seed. By its size I bet it sprang up from a seed - no one would want to have an orchard of trees that tall.
Are the pears soft or hard?
I've been told that Asian pear varieties usually have a "shaggy" bark - so I would guess that yours is one of the many European varieties.
If you use synthetic fertilizer, you need to fertilize late winter/early spring before it blooms. Too much Nitrogen will promote limb and foliage and will suppress fruiting. I shovel a lot of composted horse manure under the dripline of mine all during the late fall and winter months. When I used syn. fertilizers, my trees would get powdery mildew and some blight and worms in the fruit, but all that disappeared after a few years of the manure.
xtm