Customer Loyalty is an episode of The Office that guest stars which Greek-Canadian comedian?
Customer Loyalty (The Office):  The episode guest stars Chris Diamantopoulos as Brian the boom mike operator, and Ben Silverman as Isaac, a coworker of Jim's. Chris Diamantopoulos: Christopher "Chris" Diamantopoulos (born May 9, 1975; Greek: Χριστόφορος "Κρις" Διαμαντόπουλος ) is a Greek-Canadian actor and comedian.
Christopher "Chris" Diamantopoulos