[1] His father, Wolfgang Reimann [de], served as choirmaster at Berlin Cathedral; his mother was an oratorio singer and voice teacher.

[2] He studied at the Musikhochschule Berlin, composition and counterpoint with Boris Blacher and Ernst Pepping, and piano with Otto Rausch.

[3] Working with singers such as Catherine Gayer, Brigitte Fassbaender and Dietrich Fischer-Dieskau increased his sensibility for the potential of voices.

His first opera was in 1965 Ein Traumspiel,[1] to a libretto that Carla Henius based on Strindberg's A Dream Play in the translation by Peter Weiss; it was premiered on 20 June 1965 at the Opernhaus Kiel.

[2][3] Reimann was co-editor and pianist of the record label Orfeo's album series Edition zeitgenössisches Lied (contemporary song).

[4] Invited by Walter Fink, he was the seventh composer featured in the annual Komponistenporträt of the Rheingau Musik Festival in 1997, in songs and chamber music with the Auryn Quartet, playing the piano himself.