Dopplereffekt is an electronic music act which has been active since at least 1995 (year of first release). It is named after the German word for the Doppler effect. While the musical style and the act's image changed radically during a non-release period from 1999 to 2003, two steady characteristics are the display of a thematic affiliation with science and the obvious use of pseudonyms and the hence rumoured but unconfirmed identities of the members.
The main member during all periods has probably been producer/ artist Gerald Donald alias "Rudolf Klorzeiger". Donald is generally accepted to be also the author of the acts Heinrich Müller/ Der Zyklus, Japanese Telecom and Arpanet as well as one half of the band Drexciya (with James Stinson). During that period the sound of these two acts showed strong similarities, in their detroit electro sound that took influences from industrial, new wave, electro-pop and others, reforming them in a style which is musically complex, often using jazzy modal sequences, and alongside other Detroit based acts on the labels Underground Resistance and direct beat they were highly influential in the 90s' revival of electro. The 1999 compilation of all Dopplereffekt releases from this period, Gesamtkunstwerk, depicted Donald with a new member, "To Nhan Le Thi", who most likely had not been involved with the old material but was given credit anyway and who has been a steady and visible member since, giving occasional live performances.