It is possible that Wagner learned the organ building trade from Schnitger's student Matthäus Hartmann (died ca.
Wagner apparently died in Salzwedel while working on his last organ for the Marienkirche there at age 59, as it was completed by Gottlieb Scholtze.
From his workshop in Berlin, his sphere of activity extended mainly to the northern German Prussian Hohenzollern states, in addition to the residential cities of Berlin (8 organs) and Potsdam (4) and Brandenburg an der Havel (3) to the entire Margraviate of Brandenburg including Altmark (Werben (Elbe), Salzwedel), Uckermark (Angermünde, Gramzow, Schwedt/Oder) and Neumark (Königsberg), in Pomerania (Stargard, Wartin) and the Duchy of Magdeburg.
Today, 15 organs with the largest original components have been preserved, the most valuable in the St. Peter and Paul Cathedral Brandenburg, as well as 8 cases or smaller remains.
However, the work principle cultivated in the baroque period of northern Germany was abandoned in favour of sound fusion and a single overall case.
His casings were rich in variation, often bearing sculptural decoration and occasionally moving timpani and trumpet angels in the Silesian tradition, inspired by Johann Michael Röder.
On 26 August 2006, the Joachim Wagner Society was founded in Rühstädt with the aim of researching and maintaining his unique heritage.