Basically, there are two big Egon Schiele collectors in the world: Ronald Lauder (the heir to the Estee Lauder empire) and Rudolf Leopold. It so happens that both of them have mounted their own museum, Lauder opening the Neue Galerie in NYC, and Leopold opening the Leopold Museum in Vienna, in 2001. This book, written by Rudolf Leopold himself, illustrates and explains most of the works (paintings, watercolors and drawings) that comprise his collection. Each work is accompanied by a short (sometimes too short) analysis and is beautifully illustrated, even though one would have appreciated some magnified details, especially for the oil paintings, in order to get a better idea of the texture of the works. The other shortcoming of this book is that the provenance of the works is never mentioned, which, in this case, is a major information gap.
"Wally" is the companion piece to the Schiele self-portrait shown on the cover.....which was looted by the nazis and ended up in Leopold's collection. Long story short, Rudolf Leopold was a ruthless collector who had no problem backstabbing Jewish victims to get what he wanted. There are many other Schiele books to choose from.