Impressionist or Post Impressionist, whatever you may place him, his work is amazing.
I go to used book sales and pick up art books if I can. I saw one on Degas and for $3 figured I couldn't loose.
He was very interested in moments, small and subtle moments of reality.
I love this painting of the horse track. The subject is of the racers sizing each other up before the race. The whole scene glows with an either early morning or late afternoon light. They are probably trotting around on grass and I like how Degas made the choice to make the ground golden instead of green (it may very well have been golden like California gets in the summer).
He took great care in laying out his paintings. In every one you will find no error in perspective or proportion, which is amazing.
I admire his use of contour and color. Some say that many of his paintings are cold and aloof, but this one is warm and expressive.