Since 2024, Jellis Jansen is an attorney with the Supreme Court Litigation practice group at Pels Rijcken. Here, he is involved with and consults on proceedings before the Supreme Court of the Netherlands that concern a broad range of private and commercial law topics.
In 2024, Jellis graduated with honours (cum laude) from the Radboud University, where he completed the research master Business & Law. Previously he had obtained a bachelor's degree in Law and a master's degree in Business Administration with a specialisation in Strategic Management from that same university.
During his studies, he was a board member of the Nijmegen Legal Honors Society Sapere Aude, private law lecturer and student assistant at the journal Case Law Business & Law and at the Financial Law Centre.