From 2006-2014, Cornelius was a programmer for Retro Studios, working on Metroid Prime 3: Corruption, New Play Control! Metroid Prime, New Play Control! Metroid Prime 2: Dark Echoes and Metroid Prime Trilogy, along with their Donkey Kong Country games. Exactly where he is working now is unknown - his LinkedIn page states that he is presently a software engineer for both Retro since 2015, and Armature Studio since 2014 (Armature was founded by several Retro veterans). However, on his Facebook page, his biography states that he no longer works for either.