The men behind the Dialog-label (a part of the Sonar Kollektiv) are Stefan Leisering and Axel Reinemer aka Extended Spirit, Pathless and 2/6 of Jazzanova.
This label was originally used as a platform for the first Extended Spirit releases. Soon thereafter artists like Reunion, Soul Quality Quartet, Maffia Sound System ... joined the label - not just because they seemed to fit perfectly into the labels "freestyle"-concept.
Axel and Stefan began in 1990 to produce mainly HipHop, doing work for Cora E, A Real Dope Thing, Spax and Fettes Brot.