Along with Beggars of Life - the excellent 1928 film starring Louise Brooks, Wellman Sr directed many other notable films, including Wings, Public Enemy, Call of the Wild, Beau Geste, the original A Star Is Born, and The Ox-Bow Incident. He is certainly one of the great directors of his time. His son, with whom I spoke, has recently authored a book.
I haven't yet seen the book, but Wellman Jr told me the book does discuss Louise Brooks. I am looking forward to getting a copy, and all interested should check it out. More about the book and its subject and the author at www.williamwellmanjr.com