The story
The business was founded in 1973 by Gerhard Glaser and Wilhelm Dirks as Glaser-Dirks Flugzeugbau GmbH.
In 2018 the company received an order to build "a large number" of the Volocopter 2X design under contract to Volocopter.
From Wikipedia’s article on DG Flugzeugbau, shared under CC BY-SA 4.0.3