I believe in transparency
- BS Web Services GmbH, founder (1996), CEO
- OpenBSD, developer since 2002
- net-activities GmbH, CEO since 2014
- Muniam, co-founder, 2016
- Stichting EuroBSDcon (EuroBSDcon Foundation), board of directors
- AsiaBSDcon, program committee, since 2016
- Standpunkt.Schanze e. V., deputy chairman
- Hamburg Chamber of Commerce, elected member of the plenrary
- CCC e. V.
- Deutscher Alpenverein e. V.
- Pro Asyl e. V.
- Greenpeace e. V.
- SRG Sternschanze n. e. V., co-founder
possibly incomplete due to incompetence, not malice