Apple TV+’s Severance is a convoluted show with several important characters and narratives to keep track of, and Burt and Irving’s is one of the most crucial. After three years, the mind-bending sci-fi show with episodes directed by Ben Stiller is finally back, and the long gap contributes to the confusion one might experience tuning back in. Severance’s cast features several acting all-stars, including veteran talents like John Turturro (The Batman, Transformers) and Christopher Walken (Dune: Part Two, Pulp Fiction), who play Irving and Burt, respectively.

https://screenrant.com/severance-burt-character-lumon-role-irving-relationship-explained/