In 1993, he was employed by the
Hamburg Institute for Social Research and became known for the controversial
Wehrmachtsausstellung (Wehrmacht Exhibition) that focused on German war crimes and atrocities during World War II. The Polish historian
Bogdan Musial pointed out in an article published in 1999 that a number of photos that allegedly portrayed Wehrmacht war crimes in reality were photos of Soviet war crimes committed by the
Red Army, and also stated that around half of all photos used in the exhibition had nothing to do with war crimes. In 1995, military historian
Rolf-Dieter Müller, scientific director of the
German Armed Forces Military History Research Office, stated that the exhibition was deliberately misleading. After criticisms about incorrect attribution and captioning of some of the images in the exhibition, the exhibition was withdrawn in 1999 for review. Heer no longer participated in
Wehrmachtsausstellung because, he could not agree with
Jan Philipp Reemtsma on a concept for the new version. Herr was a
fellow of the Hamburg Institute for Social Research until August 2000. The display was suspended pending review of its content by a committee of historians. The committee's report in 2000 stated that accusations of forged materials were not justified, but some of the exhibit's documentation had inaccuracies. About one per cent of photographs had been incorrectly attributed: "A committee of historians, while confirming the fundamental thesis of the display, discovered that 20 of the 1400 photographs depicted Soviet crimes, that is, murders by NKVD, rather than the acts of German soldiers." The committee recommended that the exhibition be reopened in revised form, presenting the material and, as far as possible, leaving the formation of conclusions to the exhibition's viewers. The revised exhibition was named
Verbrechen der Wehrmacht. Dimensionen des Vernichtungskrieges 1941–1944. ("Crimes of the German Wehrmacht: Dimensions of a War of Annihilation 1941–1944"). It traveled from 2001 to 2004. In 1997, Heer was awarded the
Carl von Ossietzky Medal, for his work with the
Wehrmachtsausstellung. == Further exhibitions and publications ==