One of the Episcopal Church's premier theologians from the latter portion of the 19th century. If you haven't heard of him, it's because Yankee difficulty with the Confederate States of America, the army of which Dubose served as a chaplain during the War Between The States, prevents him from being too dramatically acknowledged lest his early service distract from the preferred historical narrative of our tradition.
However, some of his books are still around. As is a well-received biography.