Olav Anton Thommessen

In 2015 Thommessen initiated a lengthy debate in the music journal Ballade over Paus' Concerto for Timpani and Orchestra and the merits of the contemporary use of tonal music; it was described as "the biggest public debate about art music" in Norway since the 1970s.

Thommessen has also been active in stylistic and aesthetic discourse and is regarded as a critic of non-modernist and tonal music. In addition to public debate, his stance on this matter has also led to compositional output by third parties: a 2006 letter he wrote to the then-26 year old composer Marcus Paus was years later utilized as the libretto for Paus' opera monologue The Teacher Who Was Not To Be, which premiered at the concert "Paus & Paus" (with works by Marcus Paus and Ole Paus) in the Atrium of the University of Oslo as part of Oslo Opera Festival in 2013. Thommessen was later identified by Paus as the previously anonymous librettist. The opera monologue was included on the album Requiem/Trisyn/Læreren som ikke ble (2022) alongside the work Requiem by Marcus and Ole Paus. It was also featured in the first episode of the podcast series Paus og Castle blir kloke på musikklivet (Paus and Castle Figure Out Music Life) in 2021. In the letter/libretto, Thommessen wrote:

He is a son of the diplomat Knut Thommessen (né Knut Saenger), a grandson of the German gynecologist Hans Saenger and a great-grandson of the gynecologist Max Saenger (also spelled Sänger). He trained in the United States, earning degrees from Westminster Choir College and Indiana University. He is a former professor of composition at the Norwegian Academy of Music, where he was employed in 1972. He retired in 2014.

Olav Anton Thommessen (born 16 May 1946) is a Norwegian contemporary composer who has been one of the foremost modernist composers in Norway since the 1970s. His main compositions include Et glassperlespill and Gjennom Prisme. He was a professor of composition at the Norwegian Academy of Music until retiring in 2014, and has also been an influential figure in music education and music organisations in Norway. Thommessen has played a significant role in aesthetic discourse in Norway and is known for his modernist and atonal stance. In later life he has become known for engaging in a critical public dialogue with his former student Marcus Paus about the future of art music, that has resulted in the opera monologue The Teacher Who Was Not To Be with a libretto by Thommessen; a 2015 debate between the two was described as "the biggest public debate about art music" in Norway since the 1970s.