Arno graduated as Master of Laws cum laude at the Catholic University of Leuven in 2021. He spent the first two years of his studies at the Kulak Campus in Kortrijk. He specialised in social law and expressed this in his research, delving deeper into topics such as privacy and camera surveillance at the workplace.

Arno joined the team of Claeys & Engels on 1 September 2021 and has been a member of the bar of West Flanders since then. He is active in the different branches of employment law.