This is not a biography as such, but one of the reasons for reading an art book is the pictures.
This work is the product of a major Degas exhibit, with about 400 excellent illustrations (almost all in color), and accompanied by copious background information.
The text, although rather dry, gives a great idea of his achievements and breadth.
It is sectioned off into small segments accompanying each plate, and also accompanying each phase of his career. So I found myself, skimming somewhat, always looking at all the plates, and sometimes giving close scrutiny parts of particular interest to me.