In 1996, Lars-Johan was one of the co-founders of Netnod and has worked there ever since. He holds an MSc in Engineering Physics from the Royal Institute of Technology (KTH) in Stockholm where he also worked as a Senior Systems Specialist, focusing on the operation of IP networks and Unix systems. 

Lars-Johan is an expert in DNS and an experienced speaker. He works globally with protocol specifications and management of the DNS system. He has held positions in organisations such as the IETF and ICANN. Lars-Johan currently serves as chair of the Customer Standing Committee (CSC) at ICANN, which audits the work of Public Techinical Identifiers (PTI), the ICANN affiliate that, among other things, administrates that DNS root zone. 

At a more local level, he works with the planning of Netnod operations of infrastructure systems. In addition to his work at Netnod, Lars-Johan gives courses in DNS and how the Internet works all over the world.