Question: Which French-born composer formed The International Composers’ Guild?

Context articles: Arnold Schönberg Prize
Mario Bertoncini
Edgard Varèse
International Composers' Guild
Jörn-Uwe Fahrenkrog-Petersen
Holeg Spies
Salvatore Martirano Memorial Composition Award
Amériques
Varèse Sarabande
Frances James (soprano)

The International Arnold Schönberg Prize was established in 2001, and named after the Austrian composer Arnold Schönberg, thanks to the initiative of Kent Nagano, the former principal conductor and musical director of the Deutsches Symphonie-Orchester Berlin, together with Deutschlandradio.
 The prize is awarded by the Arnold Schönberg Center (Vienna, Austria) to international composers.
 The prize money is 12,500 €.
Mario Bertoncini (born 1932, Rome) is an Italian composer, pianist, and music educator.
 In 1962 he was awarded the Nicola d'Atri Prize by the Accademia Nazionale di Santa Cecilia for his "Sei Pezzi per orchestra" and in 1965 he was awarded both the Gaudeamus International Composers Award and the Fondation europeènne de la Culture prize for "Quodlibet".
 He has performed as a concert pianist with symphony orchestras throughout Europe and North America and in Israel and Korea.
Edgard Victor Achille Charles Varèse (] ; also spelled Edgar Varèse; December 22, 1883 – November 6, 1965) was a French-born composer who spent the greater part of his career in the United States.
The International Composers’ Guild was an organization created in 1921 by Edgard Varèse.
 It was responsible for performances and premieres of works by Béla Bartók, Alban Berg, Erik Satie, Carlos Chávez, Henry Cowell, Charles Ives, Maurice Ravel, Wallingford Riegger, Francis Poulenc, and Anton von Webern, and others.
Jörn-Uwe Fahrenkrog-Petersen (born March 10, 1960) is a keyboard player, producer and composer.
 For two decades he has been one of the most known and successful international composers/music producers and artists coming from Germany.
 He was nominated for the “Echo Awards” as a producer of the year two times, and nominated for the German Emmy award as host/judge for the TV show “Pop Stars”.
Holeg Spies is a French-born composer and music producer best known for his collaboration in film music with Patrick Savage as Savage & Spies notably for the cult horror film The Human Centipede (First Sequence), James Caan's thriller The Outsider and Raindance Film Festival award winning true story drama Selling Isobel by Rudolf Buitendach.
The Salvatore Martirano Memorial Composition Award is an international composers' competition held annually in memory of Salvatore Martirano (1927-1995), who was an internationally acclaimed American composer and served as professor of composition at the University of Illinois from 1963 to 1995.
 The first place prize consists of US$1,000 and a performance by the Illinois Modern Ensemble at the Krannert Center for the Performing Arts.
Amériques is a musical composition by the French-born composer Edgard Varèse.
Varèse Sarabande is an American record label, distributed by Universal Music Group, which specializes in film scores and original cast recordings.
 It aims to reissue rare or unavailable albums, as well as newer releases by artists no longer under a contract.
 The label's name was derived from combining French-born composer Edgard Varèse's last name with the musical term sarabande, a slow Spanish dance.
Frances James (3 February 1903 22 August 1988) was a Canadian soprano who specialized in concert repertoire.
 She worked prolifically as a performer on CBC Radio and as a recitalist from the late 1920s through the 1950s; premiering works by numerous Canadian composers of note and championing works by contemporary international composers.
 Her performances were noted for their musical intelligence and sophistication.
 Her singing was admired by several important composers, including Benjamin Britten, Paul Hindemith, and Darius Milhaud.
 While her performances, both live and on radio/disc, were mainly from the concert repertoire, she did perform in some broadcasts of operas on the radio and in the 1931 world premiere of Healey Willan's ballad opera "Prince Charlie and Flora".
 In 1984 she was awarded the Canadian Music Council Medal.