Müller began his career at RTL, where as a Network Executive Producer he was responsible for a multitude of popular series, including Hinter Gittern (Behind Bars), Der Clown, Schulmädchen (Schoolgirls), and Sinan Toprak. Early on, he developed an instinct for highly popular material and serialized storytelling that continues to define his work today.
Following his time at RTL, Müller established himself as a freelance writer and producer. He developed and produced numerous show and fiction formats for both private and public broadcasters, including the ARD production Sechs auf einen Streich – Die große Märchenshow (The Great Fairy Tale Show). In 2014, he also took over management of the "RPR1 Morningshow," where he was responsible for the development and production of several comedy formats. In recent years, his focus has once again shifted heavily toward developing fictional content.
Working as a writer, producer, and executive producer, his contributions have shaped series and formats such as Herzogpark (RTL+) and Polizieruf 110: Paranoia (BR). In addition, Müller served as casting director for the ZDF comedy series Smilingen and as a cast coach for the live event format Die Passion (RTL). With Malle Olé – Das Musical, which premiered in Duisburg in early 2026, Müller successfully expanded his creative work to the stage.
As writer, executive producer, and head writer, he channels his experience from television, music, and live entertainment into this work. The musical Andreas Hofer – Lied der Freiheit (The Song of Freedom) is currently in development; for this project, Müller is responsible for the music, as well as the libretto alongside Melanie Bock. In addition to his work for film, television, and the stage, Müller works as a composer and lyricist for artists such as Peter Kraus and Mike Kraus. He complements his broad creative spectrum by working as a lecturer at renowned educational institutions like the Filmakademie Baden-Württemberg, the HFF Munich, the DFFB Berlin, and the Salzburg University of Applied Sciences, where he passes on his knowledge in genre development, format design, and TV dramaturgy.