Name this author of Humboldt's Gift and The Adventures of Augie March.
In one novel by this author, one character writes a play called Von Trenck, which is based on the title character, who in turn is supposedly based on the real-life poet Delmore Schwartz. In another novel by this author, the main  character goes to Mexico with Thea Fenchel, who is married, before falling in love with Stella Chesney. That  character is raised by his Grandma Lausch in Chicago with his brothers George, who has mental disabilities, and Simon, who works hard to be successful. In another novel by this author, the protagonist moves a statue of the goddess Mummah while in a Wariri village in Africa; that work is Henderson the Rain King. Name this author of Humboldt's Gift and The Adventures of Augie March.
In one novel by this author, one character writes a play called Von Trenck, which is based on the title character, who in turn is supposedly based on the real-life poet Delmore Schwartz.
Saul Bellow