Who did David McCullough mention in The Greater Journey that befriended Edgar Degas in France?
The Greater Journey:  Other subjects include Elihu Washburne, the American ambassador to France during the Franco-Prussian War, Elizabeth Blackwell, the first female doctor in the United States, and American artists who worked in Paris such as George Healy, Mary Cassatt, and Augustus Saint-Gaudens. Mary Cassatt:  She was born in Pennsylvania, but lived much of her adult life in France, where she first befriended Edgar Degas and later exhibited among the Impressionists.
Mary Cassatt