Next to his writing, Adrian has been working as a consultant and engineer, advising on technology, business, markets and innovation. For example, he worked for cryptography company DigiCash, a spin-off of CWI, the Dutch national research institute for mathematics and computer science. He advised the Nederlandsch Octrooibureau in a patent infringement case. And he participated as CTO in the startups Depot2 and RecruitmentNet.
Furthermore, Adrian worked as a Linux system manager, network manager, webmaster, software developer and architect, and technology advisor. He also had a web hosting company for nearly a decade, specializing in more complex, non-commodity services. As part of this, he authored the MMBase Installation HOWTO (part of The Linux Documentation Project).
Currently, Adrian works on projects involving internet and web technologies, building on Linux and open-source software. In 2009, he participated in the civil-engineering marketplace Depot2. He is also involved in several technology transfer and communication projects centering around internet and networking technology, computer and network security, cryptography, Linux, and open-source software.