Question: Who provided the German libretto to the composition by a man whose best known work is "The Threepenny Opera," which proved to be their last major collaboration?

Context articles: Barry Windsor-Smith
Vincent River (play)
Gert Fröbe
Imminent, Indeed
The Seven Deadly Sins (ballet chanté)
Bernard Pomerance
Mack the Knife (disambiguation)
Kurt Weill
Saint Joan of the Stockyards
Threepenny Novel

Barry Windsor-Smith (born Barry Smith on 25 May 1949) is a British comic book illustrator and painter whose best known work has been produced in the United States.
 He is best known for his work on Marvel Comics' "Conan the Barbarian" from 1970 to 1973.
Vincent River is a one act stage play by Philip Ridley.
 It was Ridley's fourth stage play for adults and premiered at the Hampstead Theatre, London on 6 September 2000.
 The production was the last major collaboration between Ridley and director Mathew Lloyd, who had previously directed the majority of Ridley's other theatrical works.
Karl Gerhart Fröbe, better known as Gert Fröbe (] ; 25 February 19135 September 1988), was a German film and stage actor.
 He is best known for his work as Auric Goldfinger in the James Bond film "Goldfinger", as Peachum in "The Threepenny Opera", as Baron Bomburst in "Chitty Chitty Bang Bang" and as Hotzenplotz in "Der Räuber Hotzenplotz".
Imminent, Indeed (or "Polly Peachum's Peculiar Penchant for Plosives") is a gothic adaptation of John Gay’s "The Beggar’s Opera".
 Written and directed by Bryn Manion with the assistance of Wendy Remington, and leading man, Sam.
 Produced by the Creatives and the founding board members of the company of Aisling Arts.
 This adaptation focuses on Polly Peachum's side of the story and her world as it trips alongside that of Jenny Diver, a new Peachum brother, several comically nefarious underlings, and of course, the ever villainous Henry Macheath (known as "Mack the Knife" in the Bertolt Brecht and Kurt Weill adaptation, "The Threepenny Opera").
The Seven Deadly Sins (German: "Die sieben Todsünden" , French: "Les sept péchés capitaux" ) is a satirical "ballet chanté" ("sung ballet") in seven scenes (nine movements) composed by Kurt Weill to a German libretto by Bertolt Brecht in 1933 under a commission from Boris Kochno and Edward James.
 It was translated into English by W. H. Auden and Chester Kallman.
 It was the last major collaboration between Weill and Brecht.
Bernard Pomerance (September 23, 1940 – August 26, 2017) was an American playwright and poet whose best known work is the play "The Elephant Man".
Mack the Knife (in German "Mackie Messer") is the nickname of "Macheath", a character from "The Threepenny Opera", and also the name of a song from that work.
 It is also the title of the US film adaptation of the opera.
Kurt Julian Weill (March 2, 1900April 3, 1950) was a German composer, active from the 1920s in his native country, and in his later years in the United States.
 He was a leading composer for the stage who was best known for his fruitful collaborations with Bertolt Brecht.
 With Brecht, he developed productions such as his best-known work "The Threepenny Opera", which included the ballad "Mack the Knife".
 Weill held the ideal of writing music that served a socially useful purpose.
 He also wrote several works for the concert hall.
 He became a United States citizen on August 27, 1943.
Saint Joan of the Stockyards (German: "Die Heilige Johanna der Schlachthöfe" ) is a play written by the German modernist playwright Bertolt Brecht between 1929 and 1931, after the success of his musical "The Threepenny Opera" and during the period of his radical experimental work with the "Lehrstücke".
 It is based on the musical that he co-authored with Elisabeth Hauptmann, "Happy End" (1929).
 In this version of the story of Joan of Arc, Brecht transforms her into "Joan Dark", a member of the "Black Straw Hats" (a Salvation Army-like group) in 20th-century Chicago.
 The play charts Joan's battle with Pierpont Mauler, the unctuous owner of a meat-packing plant.
 Like her predecessor, Joan is a doomed woman, a martyr and (initially, at least) an innocent in a world of strike-breakers, fat cats, and penniless workers.
 Like many of Brecht's plays it is laced with humor and songs as part of its epic dramaturgical structure and deals with the theme of emancipation from material suffering and exploitation.
ThreePenny Novel is a 1934 novel by the German dramatist and poet Bertolt Brecht, first published in Amsterdam by in 1934 as "Dreigroschenroman ".
 It is similar in structure to his more famous "The Threepenny Opera" and features several of the same characters such as Macheath, together with a general anti-capitalist focus and a didactic technique that is often associated with the dramatist.
 It is a novel that has been the focus of much critical attention and that is often described as both a continuation and a variation of the themes and motifs of Brecht's other work that focuses on alienation and on the communication of a social message.
 It can be seen alternatively as a careful development of the detective novel genre and as scathing criticism of the Brecht's own social conditions and the economic practices of German businesses and banks in the middle of the 20th century.