The title character of one of this man's works conducts business disguised 
The title character of one of this man's works conducts business disguised as Shui Ta, and another of his plays features a play-within-the-play in which Michael is protected by Grusche. In addition to The Good Woman of Setzuan and The Caucasian Chalk Circle, this man wrote a work in which Polly Peachum marries the criminal Mac the Knife and another about Eilif, Swiss Cheese, and Kattrin, the children of Anna Fierling, set during the Thirty Years War. For 10 points, name this German author of The Threepenny Opera and Mother Courage and her Children.
The title character of one of this man's works conducts business disguised as Shui Ta, and another of his plays features a play-within-the-play in which Michael is protected by Grusche.
Bertolt {Brecht}