After writing, editing, and contributing to dozens of books for GURPS, Sean Punch took over from the game's original designer Steve Jackson as the line editor for GURPS in 1995.[2]: 110 Assisted by David L. Pulver, another Canadian and veteran role-playing game designer, he took on the task of re-designing the entire rule system for the a fourth edition of GURPS beginning in September 2002.[2]: 112
Sean Punch remains the Line Editor for GURPS - equivalent to being editor-in-chief of a book series, and the key decision-maker for new rules expansions.
In an attempt to acknowledge the quality and quantity of his work, some GURPS players have used his online nickname ("Kromm") to create a tongue-in-cheek cult.[3] They leave messages in discussion groups pretending to "praise Kromm."