A & A Messebau GmbH was founded in 1983 by Frank Kölner in Düsseldorf, where it is still based. Since then, we have managed more than 2,500 projects in 14 European countries, from Lisbon to Stockholm. n 2021, the company was taken over and continued by Stephan Thoma. Full service is still offered, both for exhibition stands with system construction as well as conventional construction or mixed construction - both single-story and double-story.