Juselius holds M.Sc. in engineering and he has worked for the ICT sector since 1995 including major Nordic companies like Fortum and Telia.
Since 2004 Juselius has been involved in .FI ccTLD operations at Finnish Communications Regulatory Authority. Juselius has been elected into several board and other high level positions in the leading associations of the ICT industry including CENTR and ICANN. At the moment Juselius is chairing ISOC Finland chapter.