Moull was Principal Conductor and coach of the Trier Opera and Symphony Orchestra in Germany from 1986 to 1989, conducting both opera and concert performances, and was additionally responsible for the development of music education programs and school concerts. He was Associate Conductor of the Münster Symphony Orchestra and Opera from 1989 to 1992. The opera magazine Opernwelt presented Moull with their 'Production of the Year' award in 1992 for Francesco Cavalli's "La Calisto".
